Escenario de Packet Tracer para VoIP

Escenario de Packet Tracer para VoIP

(versión 3 del documento)

Fecha: 12 de Abril 2013

En este escenario se reproducen las configuraciones básicas para establecer llamadas entre teléfonos Cisco entre dos sucursales

conectadas a través de un tunel GRE en un ambiente MPLS simulado.

Parte de la configuración se realizó con Packet Tracer y parte con equipos reales (etiquetado QoS dentro del tunel GRE, capturas).

Acerca del documento:

1. Configuración router Rosario

2. Configuración router Córdoba

3. Configuración switch Rosario

4. Configuración switch Córdoba

5. Verificación DHCP Rosario

6. Verificación Routing Rosario

7. Pruebas

8. Comunicación en curso

9. Agregado de teléfonos en Rosario

9.1 Cambios en SW Rosario

9.2 Alta del teléfono nuevo en router Rosario

9.3 Resumen de la running-config

10 Verificación en router Rosario

10.1 Registro incompleto

10.2 Registro completo

10.3 Verificación en switch

11. Pruebas varias

11.1 Llamada entre Rosario y Córdoba

11.2 Llamada entre Rosario internos en Rosario

12 Ejempo de configuración para llamada desde Córdoba a Rosario

12.1 Configuración

12.2 Verificación

13. También es posible para reducir la configuración

14. Verificación

15. Implementación de router de contingencia

16. Verificación de servicio DHCP alternativo en PC de Rosario

17. Verificación de servicio DHCP alternativo en teléfono de Rosario

18. Con llamadas activas Rosario-Córdoba

19. Se reestablece el servicio por el router principal

20. Desconexión y reconexión del patch del teléfono

20.1 En switch

20.2 En router con CME

21. Trama con relay de DHCP para entender como se obtiene la MAC del

dispositivo a travez de la WAN

22. Trama completa transportando un paquete de voz sobre IP dentro

del túnel en la red MPLS de TECO

23. Captura real con Wireshark

23.1 Reproducción de la comunicación off-line

24. Implementación de calidad de servicio (QoS) para VoIP

24.1 En router Córdoba

25. Campos de un paquete IP con valores de QoS aplicados en una policy

26 Agregado de 8 teléfonos extra

1. Configuración router Rosario

Rosario#sh runn

Building configuration...

Current configuration : 796 bytes

version 12.4

hostname Rosario

ip dhcp pool tes (tes es por defecto el nombre asignado al pool)

network 192.168.20.0 255.255.255.0

default-router 192.168.20.1

option 150 ip 192.168.20.1 (en la opción 150 indica cual es la IP del TFTP server)

ip dhcp pool datos

network 192.168.10.0 255.255.255.0

default-router 192.168.10.1

interface Tunnel0 (para pasar tráfico privado por la red de TECO)

ip address 172.16.0.1 255.255.255.252

tunnel source FastEthernet0/1

tunnel destination 10.0.0.6

interface FastEthernet0/0 (tráfico inter-vlan)

no ip address

interface FastEthernet0/0.10 (subinterfaz para vlan 10)

description DATOS

encapsulation dot1Q 10

ip address 192.168.10.1 255.255.255.0

interface FastEthernet0/0.20 (subinterfaz para vlan 20)

description VOICE

encapsulation dot1Q 20

ip address 192.168.20.1 255.255.255.0

interface FastEthernet0/1 (tráfico WAN)

ip address 2.1.1.2 255.0.0.0

router eigrp 100 (MPLS TECO)

network 10.0.0.0 0.0.0.3

router eigrp 101 (red interna)

network 172.16.0.0 0.0.0.3

network 192.168.10.0

network 192.168.20.0

dial-peer voice 1 voip

destination-pattern 1234 (interno remoto en Cordoba)

session target ipv4:172.16.0.2 (extremo del tunel)

telephony-service

max-ephones 4 (cantidad de teléfonos soportados, depende de la plataforma)

max-dn 4 (cantidad de extensiones soportados, depende de la plataforma)

ip source-address 192.168.20.1 port 2000 (identifica cómo los teléfonos se comunicaran con el router)

auto assign 1 to 3 (cuando se conecte un teléfono se autoasignará en la config de CME, ver mas adelante)

ephone-dn 1 (declaro número de interno)

number 7890

end

Rosario#

2. Configuración router Córdoba

Cordoba#sh runn

Building configuration...

Current configuration : 1156 bytes

version 12.4

hostname Cordoba

ip dhcp pool its

network 192.168.30.0 255.255.255.0

default-router 192.168.30.1

option 150 ip 192.168.30.1

ip dhcp pool DATOS

network 192.168.40.0 255.255.255.0

default-router 192.168.40.1

interface Tunnel0

ip address 172.16.0.2 255.255.255.252

tunnel source FastEthernet0/1

tunnel destination 10.0.0.2

interface FastEthernet0/0 (tráfico inter-vlan)

no ip address

interface FastEthernet0/0.1

encapsulation dot1Q 1 native

no ip address

interface FastEthernet0/0.30

description VOICE

encapsulation dot1Q 30

ip address 192.168.30.1 255.255.255.0

interface FastEthernet0/0.40

encapsulation dot1Q 40

ip address 192.168.40.1 255.255.255.0

interface FastEthernet0/1 (tráfico WAN)

ip address 10.0.0.6 255.255.255.252

router eigrp 100 (MPLS TECO)

network 10.0.0.4 0.0.0.3

router eigrp 101 (red interna)

network 172.16.0.0 0.0.0.3

network 192.168.30.0 (voice)

network 192.168.40.0 (datos)

dial-peer voice 1 voip

destination-pattern 7890

session target ipv4:172.16.0.1

telephony-service

max-ephones 4

max-dn 4

ip source-address 192.168.30.1 port 2000

auto assign 1 to 3

ephone-dn 1 (número dado de alta manualmente)

number 1234

ephone 1 (teléfono autoasignado)

device-security-mode none

mac-address 000A.415B.5EE4 (similar al sticky de los SW)

type 7960

button 1:1

end

Cordoba#

3. Configuración switch Rosario

%ILPOWER-7-DETECT: Interface Fa0/2: Power Device detected: Cisco PD (detecta el teléfono)

ILPOWER-5-POWER_GRANTED: Interface Fa0/2: Power granted (activa PoE)

%LINK-5-CHANGED: Interface FastEthernet0/2, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to up

%LINK-5-CHANGED: Interface FastEthernet0/2, changed state to up

Switch#sh runn

Building configuration...

Current configuration : 1083 bytes

version 12.2

hostname Switch

interface FastEthernet0/1

description enlace al router

switchport access vlan 10

switchport trunk encapsulation dot1q

switchport mode trunk

switchport voice vlan 20

interface FastEthernet0/2

description Telefono y PC

switchport access vlan 10 (vlan de datos)

switchport trunk native vlan 10 (no se etiqueta con el número de VLAN)

switchport trunk encapsulation dot1q

switchport mode trunk

switchport voice vlan 20 (vlan de telefonía)

interface FastEthernet0/3

description PC comun

switchport access vlan 10

switchport mode access

---resumido---

end

Switch#sh power inline (verifico PoE)

Available:370.0(w) Used:6.3(w) Remaining:363.7(w)

Interface Admin Oper Power Device Class Max

(Watts)

--------- ------ ---------- ------- ------------------- ----- ----

Fa0/1 auto off 0.0 n/a n/a 15.4

Fa0/2 auto on 6.3 IP Phone 2 15.4

Fa0/3 auto off 0.0 n/a n/a 15.4

Fa0/4 auto off 0.0 n/a n/a 15.4

Fa0/5 auto off 0.0 n/a n/a 15.4

---resumido---

Fa0/23 auto off 0.0 n/a n/a 15.4

Fa0/24 auto off 0.0 n/a n/a 15.4

Switch#

Switch#sh vlan

VLAN Name Status Ports

---- -------------------------------- --------- -------------------------------

1 default active Fa0/1, Fa0/4, Fa0/5

Fa0/6, Fa0/7, Fa0/8, Fa0/9

Fa0/10, Fa0/11, Fa0/12, Fa0/13

Fa0/14, Fa0/15, Fa0/16, Fa0/17

Fa0/18, Fa0/19, Fa0/20, Fa0/21

Fa0/22, Fa0/23, Fa0/24, Gig0/1

Gig0/2

10 datos active Fa0/3

20 voice active

1002 ---resumido---

Switch#sh cdp nei (verifico layer 2 al teléfono con Cisco Discovery Protocol)

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID Local Intrfce Holdtme Capability Platform Port ID

Router Fas 0/1 178 R C2800 Fas 0/0

IP Phone Fas 0/2 165 H P 7960

Router Fas 0/1 178 R C2800 Fas 0/0.10

Router Fas 0/1 178 R C2800 Fas 0/0.20

Switch#

4. Configuración switch Córdoba

SW_Cordoba#sh runn

Building configuration...

hostname SW_Cordoba

interface FastEthernet0/1

switchport access vlan 40

switchport trunk native vlan 40

switchport voice vlan 30

interface FastEthernet0/24

switchport mode trunk

---resumido---

SW_Cordoba#

5. Verificación DHCP Rosario

Rosario#sh ip dhcp bind (verifico DHCP)

IP address Client-ID/ Lease expiration Type

Hardware address

192.168.20.2 00D0.FF86.DA0C -- Automatic (teléfono)

192.168.10.2 0090.0CC7.9582 -- Automatic (PC conectado a Fa0/3)

192.168.10.5 00D0.FF37.AA8E -- Automatic (PC conectado al teléfono)

Rosario#

6. Verificación Routing Rosario

Rosario#sh ip route

---resumido---

10.0.0.0/30 is subnetted, 2 subnets

C 10.0.0.0 is directly connected, FastEthernet0/1 (extremo ISP-Rosario)

D 10.0.0.4 [90/30720] via 10.0.0.1, 00:18:47, FastEthernet0/1 (extremo Córdoba-ISP)

172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks

C 172.16.0.0/30 is directly connected, Tunnel0

C 192.168.10.0/24 is directly connected, FastEthernet0/0.10 (VLAN datos Rosario)

C 192.168.20.0/24 is directly connected, FastEthernet0/0.20 (VLAN voice Rosario)

D 192.168.30.0/24 [90/26882560] via 172.16.0.2, 00:14:54, Tunnel0 (voice Córdoba)

D 192.168.40.0/24 [90/26882560] via 172.16.0.2, 00:00:14, Tunnel0 (datos Córdoba)

Rosario#

7. Pruebas

%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up

%LINK-5-CHANGED: Interface FastEthernet0/1, changed state to up

%LINK-5-CHANGED: Interface Vlan1, changed state to up

%LINK-5-CHANGED: Interface Vlan1, changed state to administratively down

%LINK-3-UPDOWN: Interface ephone_dsp DN 1.1, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up

%IPPHONE-6-REGISTER: ephone-1 IP:3.0.0.1 Socket:2 DeviceType:Phone has registered.

Rosario#sh ephone (verifico teléfono registrado)

ephone-1 Mac:00D0.FF86.DA0C TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:3.0.0.1 1025 7960 keepalive 43 max_line 2

button 1: dn 1 number 7890 CH1 IDLE (teléfono on hook)

Router#

8. Comunicación en curso

Rosario#sh ephone

ephone-1 Mac:00D0.FF86.DA0C TCP socket:[1] activeLine:1 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:1 offhook:1 ringing:1 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.2 1025 7960 keepalive 43 max_line 2

button 1: dn 1 number 7890 CH1 CONNECTED

Active Call on DN 1chan 1 :7890 0.0.0.0 611 to 192.168.20.1 2000 via 0.0.0.0 (no es al teléfono de Córdoba

G729 20 bytes no vad sino al router local)

Tx Pkts 0 bytes 0 Rx Pkts 0 bytes 0 Lost 0

Jitter 0 Latency 0 callingDn -1 calledDn -1 (media path callID 17 srcCallID 18)

Rosario#

Cordoba#sh ephone

ephone-1 Mac:000A.415B.5EE4 TCP socket:[1] activeLine:1 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:1 offhook:1 ringing:1 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.30.2 1027 7960 keepalive 43 max_line 2

button 1: dn 1 number 1234 CH1 CONNECTED

Active Call on DN 1chan 1 :1234 0.0.0.0 611 to 192.168.30.1 2000 via 0.0.0.0 (no es al teléfono de Rosario

G729 20 bytes no vad sino al router local)

Tx Pkts 0 bytes 0 Rx Pkts 0 bytes 0 Lost 0

Jitter 0 Latency 0 callingDn -1 calledDn -1 (media path callID 17 srcCallID 18)

Cordoba#

9. Agregado de un teléfono en Rosario

9.1 Cambios en SW Rosario

interface FastEthernet0/4

switchport voice vlan 20

9.2 Alta del teléfono nuevo en router Rosario

Rosario#conf t

Enter configuration commands, one per line. End with CNTL/Z.

Rosario(config)#ephone-dn 2

Rosario(config-ephone-dn)# number 7891

Rosario(config-ephone-dn)#^Z

%LINK-3-UPDOWN: Interface ephone_dsp DN 2.1, changed state to up

%IPPHONE-6-REGISTER: ephone-2 IP:192.168.20.3 Socket:2 DeviceType:Phone has registered.

9.3 Resumen de la running-config

ephone-dn 1

number 7890

ephone-dn 2 (dado de alta manual)

number 7891

ephone 1

device-security-mode none

mac-address 00D0.FF86.DA0C

type 7960

button 1:1

ephone 2 (autoasignado)

device-security-mode none

mac-address 00D0.9787.0E3D

type 7960

button 1:2

10 Verificación en router Rosario

10.1 Registro incompleto

Rosario#sh ephone

ephone-1 Mac:00D0.FF86.DA0C TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.2 1025 7960 keepalive 43 max_line 2

button 1: dn 1 number 7890 CH1 IDLE

ephone-2 Mac:00D0.9787.0E3D TCP socket:[1] activeLine:0 UNREGISTERED

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:0.0.0.0 0 keepalive 43 max_line 2

button 1: dn CH1 DOWN

10.2 Registro completo

Rosario#sh ephone (de ambos teléfonos)

ephone-1 Mac:00D0.FF86.DA0C TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.2 1025 7960 keepalive 43 max_line 2

button 1: dn 1 number 7890 CH1 IDLE

ephone-2 Mac:00D0.9787.0E3D TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.3 1034 7960 keepalive 43 max_line 2

button 1: dn 2 number 7891 CH1 IDLE

Rosario#sh ip dhcp bind

IP address Client-ID/ Lease expiration Type

Hardware address

192.168.20.2 00D0.FF86.DA0C -- Automatic

192.168.20.3 00D0.9787.0E3D -- Automatic (teléfono nuevo)

192.168.10.2 0090.0CC7.9582 -- Automatic

192.168.10.5 00D0.FF37.AA8E -- Automatic

10.3 Verificación en switch

Switch#sh power inline

Available:370.0(w) Used:12.6(w) Remaining:357.4(w) (datos de la potencia utilizada por PoE)

Interface Admin Oper Power Device Class Max

(Watts)

--------- ------ ---------- ------- ------------------- ----- ----

Fa0/1 auto off 0.0 n/a n/a 15.4

Fa0/2 auto on 6.3 IP Phone 2 15.4

Fa0/3 auto off 0.0 n/a n/a 15.4

Fa0/4 auto on 6.3 IP Phone 2 15.4 (teléfono nuevo)

Fa0/5 auto off 0.0 n/a n/a 15.4

---resumido---

Switch#sh cdp nei

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID Local Intrfce Holdtme Capability Platform Port ID

IP Phone Fas 0/4 153 H P 7960 (teléfono nuevo)

IP Phone Fas 0/2 153 H P 7960

Rosario Fas 0/1 154 R C2800 Fas 0/0

Rosario Fas 0/1 154 R C2800 Fas 0/0.10

Rosario Fas 0/1 154 R C2800 Fas 0/0.20

Switch#

11. Pruebas varias

11.1 Llamada entre Rosario y Córdoba

Rosario#sh ephone (llamada desde 7891 a Córdoba)

ephone-1 Mac:00D0.FF86.DA0C TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.2 1025 7960 keepalive 43 max_line 2

button 1: dn 1 number 7890 CH1 IDLE

ephone-2 Mac:00D0.9787.0E3D TCP socket:[1] activeLine:1 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:1 offhook:1 ringing:1 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.3 1034 7960 keepalive 43 max_line 2

button 1: dn 2 number 7891 CH1 CONNECTED

Active Call on DN 2chan 1 :7891 192.168.20.3 1034 to 192.168.20.1 2000 via 192.168.20.3

G729 20 bytes no vad

Tx Pkts 0 bytes 0 Rx Pkts 0 bytes 0 Lost 0

Jitter 0 Latency 0 callingDn -1 calledDn -1 (media path callID 17 srcCallID 18)

Rosario#

11.2 Llamada entre Rosario internos en Rosario

Rosario#sh ephone (llamada entre teléfonos de Rosario)

ephone-1 Mac:00D0.FF86.DA0C TCP socket:[1] activeLine:1 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:1 offhook:1 ringing:1 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.2 1025 7960 keepalive 43 max_line 2

button 1: dn 1 number 7890 CH1 CONNECTED

Active Call on DN 1chan 1 :7890 0.0.0.0 611 to 192.168.20.1 2000 via 0.0.0.0

G729 20 bytes no vad

Tx Pkts 0 bytes 0 Rx Pkts 0 bytes 0 Lost 0

Jitter 0 Latency 0 callingDn -1 calledDn -1 (media path callID 17 srcCallID 18)

ephone-2 Mac:00D0.9787.0E3D TCP socket:[1] activeLine:1 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:1 offhook:1 ringing:1 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.3 1034 7960 keepalive 43 max_line 2

button 1: dn 2 number 7891 CH1 CONNECTED

Active Call on DN 2chan 1 :7891 192.168.20.3 1034 to 192.168.20.1 2000 via 192.168.20.3

G729 20 bytes no vad

Tx Pkts 0 bytes 0 Rx Pkts 0 bytes 0 Lost 0

Jitter 0 Latency 0 callingDn -1 calledDn -1 (media path callID 17 srcCallID 18)

Rosario#

12 Ejempo de configuración para llamada desde Córdoba a Rosario

12.1 Configuración

Cordoba#conf t (se debe configurar cómo/donde econtrar este nuevo número)

Enter configuration commands, one per line. End with CNTL/Z.

Cordoba(config)#

Cordoba(config)#dial-peer voice 2 voip

Cordoba(config-dial-peer)# destination-pattern 7891 (interno)

Cordoba(config-dial-peer)# session target ipv4:172.16.0.1 (extremo del tunel GRE)

Cordoba(config-dial-peer)#^Z

Cordoba#

12.2 Verificación

dial-peer voice 1 voip

destination-pattern 7890

session target ipv4:172.16.0.1

dial-peer voice 2 voip

destination-pattern 7891 (nuevo teléfono)

session target ipv4:172.16.0.1 (mismo gateway)

13. También es posible para reducir la configuración

Cordoba#conf t

Enter configuration commands, one per line. End with CNTL/Z.

Cordoba(config)#no dial-peer voice 2 voip (elimina agregado)

Cordoba(config)#dial-peer voice 1 voip (edita plan original del interno 7890)

Cordoba(config-dial-peer)#destination-pattern 78.. (esto permite todos los internos que comiencen con 78)

Cordoba(config-dial-peer)#^Z

Cordoba#

14. Verificación

Cordoba#show runn

---resumido---

dial-peer voice 1 voip

destination-pattern 78..

session target ipv4:172.16.0.1

15. Implementación de router de contingencia

16. Verificación de servicio DHCP alternativo en PC de Rosario: el servicio se brinda desde Córdoba mediante DHCP relay.

PC>ipconfig (luego de un /renew)

IP Address......................: 192.168.10.1

Subnet Mask.....................: 255.255.255.0

Default Gateway.................: 192.168.10.254 (tiene el gateway alternativo)

17. Verificación de servicio DHCP alternativo en teléfono de Rosario: el servicio se brinda desde Córdoba mediante DHCP relay.

Cordoba#sh ip dhcp bind (verificamos)

IP address Client-ID/ Lease expiration Type

Hardware address

192.168.30.2 000A.415B.5EE4 -- Automatic

192.168.20.1 00D0.FF86.DA0C -- Automatic (teléfono)

192.168.20.2 00D0.9787.0E3D -- Automatic (teléfono)

192.168.10.1 0090.0CC7.9582 -- Automatic (PC)

Cordoba#

Cordoba#conf t

Enter configuration commands, one per line. End with CNTL/Z.

Cordoba(config)#ephone-dn 2 (creamos los internos para Rosario)

%LINK-3-UPDOWN: Interface ephone_dsp DN 2.1, changed state to up

Cordoba(config-ephone-dn)#number 7891

Cordoba(config-ephone-dn)#exit

Cordoba(config)#ephone-dn 3 (creamos los internos para Rosario)

%LINK-3-UPDOWN: Interface ephone_dsp DN 3.1, changed state to up

Cordoba(config-ephone-dn)#number 7890

Cordoba(config-ephone-dn)#^Z

Cordoba#

%SYS-5-CONFIG_I: Configured from console by console

%IPPHONE-6-REGISTER: ephone-3 IP:192.168.20.2 Socket:2 DeviceType:Phone has registered.

%IPPHONE-6-REGISTER: ephone-2 IP:192.168.20.1 Socket:2 DeviceType:Phone has registered.

Cordoba#sh ephone (verificamos los internos registrados desde Rosario)

ephone-1 Mac:000A.415B.5EE4 TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.30.2 1025 7960 keepalive 43 max_line 2

button 1: dn 1 number 1234 CH1 IDLE

ephone-2 Mac:00D0.FF86.DA0C TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.1 1060 7960 keepalive 43 max_line 2

button 1: dn 3 number 7890 CH1 IDLE

ephone-3 Mac:00D0.9787.0E3D TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.2 1060 7960 keepalive 43 max_line 2

button 1: dn 2 number 7891 CH1 IDLE

Cordoba#

18. Con llamadas activas Rosario-Córdoba

Cordoba#sh ephone

ephone-1 Mac:000A.415B.5EE4 TCP socket:[1] activeLine:1 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:1 offhook:1 ringing:1 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.30.2 1025 7960 keepalive 43 max_line 2

button 1: dn 1 number 1234 CH1 CONNECTED

Active Call on DN 1chan 1 :1234 192.168.30.2 1025 to 192.168.30.1 2000 via 192.168.30.2

G729 20 bytes no vad

Tx Pkts 0 bytes 0 Rx Pkts 0 bytes 0 Lost 0

Jitter 0 Latency 0 callingDn -1 calledDn -1 (media path callID 17 srcCallID 18)

ephone-2 Mac:00D0.FF86.DA0C TCP socket:[1] activeLine:1 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:1 offhook:1 ringing:1 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.1 1060 7960 keepalive 43 max_line 2

button 1: dn 3 number 7890 CH1 CONNECTED

Active Call on DN 3chan 1 :7891 192.168.20.1 1060 to 192.168.30.1 2000 via 192.168.20.1

G729 20 bytes no vad

Tx Pkts 0 bytes 0 Rx Pkts 0 bytes 0 Lost 0

Jitter 0 Latency 0 callingDn -1 calledDn -1 (media path callID 17 srcCallID 18)

ephone-3 Mac:00D0.9787.0E3D TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.2 1060 7960 keepalive 43 max_line 2

button 1: dn 2 number 7891 CH1 IDLE

Cordoba#

Backup#sh runn

Building configuration...

Current configuration : 1000 bytes

version 12.4

hostname Backup

interface Tunnel1

ip address 172.16.0.5 255.255.255.252

tunnel source FastEthernet0/1

tunnel destination 10.0.0.6

interface FastEthernet0/0

no ip address

interface FastEthernet0/0.10

description VLAN datos

encapsulation dot1Q 10

ip address 192.168.10.254 255.255.255.0

ip helper-address 192.168.30.1 (reenvía los pedidos DHCP a Córdoba)

interface FastEthernet0/0.20

description VLAN voice

encapsulation dot1Q 20

ip address 192.168.20.254 255.255.255.0

ip helper-address 192.168.30.1 (reenvía los pedidos DHCP a Córdoba)

interface FastEthernet0/1

description MPLS TECO

ip address 10.0.0.10 255.255.255.252

router eigrp 100

network 10.0.0.8 0.0.0.3 (MPLS TECO)

no auto-summary

router eigrp 101

network 192.168.10.0 (VLAN datos)

network 192.168.20.0 (VLAN voice)

network 172.16.0.4 0.0.0.3 (tunel GRE)

no auto-summary

end

Backup#

Cordoba#sh runn

Building configuration...

Current configuration : 1760 bytes

hostname Cordoba

ip dhcp pool its

network 192.168.30.0 255.255.255.0

default-router 192.168.30.1

option 150 ip 192.168.30.1

ip dhcp pool voice-rosario (pool DHCP para pedidos de voice desde Rosario)

network 192.168.20.0 255.255.255.0

default-router 192.168.20.254 (nótese gateway alternativo)

option 150 ip 192.168.30.1

ip dhcp pool datos-rosario (pool DHCP para pedidos de datos desde Rosario)

network 192.168.10.0 255.255.255.0

default-router 192.168.10.254 (nótese gateway alternativo)

interface Tunnel0 (principal)

ip address 172.16.0.2 255.255.255.252

tunnel source FastEthernet0/1

tunnel destination 10.0.0.2

bandwidth 2048 (agregado para prioridad sobre Tunnel1, PT no soporte este comando)

interface Tunnel1 (secundario)

ip address 172.16.0.6 255.255.255.252

tunnel source FastEthernet0/1

tunnel destination 10.0.0.10

bandwidth 512 (agregado para prioridad de Tunnel1, PT no soporte este comando)

interface FastEthernet0/0

description LAN Cordoba

ip address 192.168.30.1 255.255.255.0

interface FastEthernet0/1

description MPLS TECO

ip address 10.0.0.6 255.255.255.252

router eigrp 100

network 10.0.0.4 0.0.0.3

no auto-summary

router eigrp 101

network 172.16.0.0 0.0.0.3 (túnel principal)

network 192.168.30.0 (LAN Córdoba)

network 172.16.0.4 0.0.0.3 (túnel secundario)

no auto-summary

dial-peer voice 1 voip

destination-pattern 78..

session target ipv4:192.168.20.0 (red de voice Rosario, alcanzable desde ambos túneles)

telephony-service

max-ephones 4

max-dn 4

ip source-address 192.168.30.1 port 2000

auto assign 1 to 3

ephone-dn 1 (teléfono local)

number 1234

ephone-dn 2 (teléfonos de Rosario)

number 7891

ephone-dn 3 (teléfonos de Rosario)

number 7890

ephone 1

device-security-mode none

mac-address 000A.415B.5EE4

type 7960

button 1:1

ephone 2 (autoasignado una vez registrado)

device-security-mode none

mac-address 00D0.FF86.DA0C (la dirección MAC trabaja sólo local, pero el relay de DHCP la publica por la WAN)

type 7960

button 1:3

ephone 3 (autoasignado una vez registrado)

device-security-mode none

mac-address 00D0.9787.0E3D (la dirección MAC trabaja sólo local, pero el relay de DHCP la publica por la WAN)

type 7960

button 1:2

end

Cordoba#

19. Se reestablece el servicio por el router principal

Rosario#sh ephone (verificamos teléfonos)

ephone-1 Mac:00D0.FF86.DA0C TCP socket:[1] activeLine:0 UNREGISTERED

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:0.0.0.0 0 7960 keepalive 43 max_line 2

button 1: dn 1 number 7890 CH1 DOWN

ephone-2 Mac:00D0.9787.0E3D TCP socket:[1] activeLine:0 UNREGISTERED

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:0.0.0.0 0 7960 keepalive 43 max_line 2

button 1: dn 2 number 7891 CH1 DOWN

Rosario#

%IPPHONE-6-REGISTER: ephone-1 IP:192.168.20.3 Socket:2 DeviceType:Phone has registered.

Rosario#sh ephone (verificamos teléfonos)

ephone-1 Mac:00D0.FF86.DA0C TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.3 1026 7960 keepalive 43 max_line 2

button 1: dn 1 number 7890 CH1 IDLE (verificamos registro de sólo un teléfono)

ephone-2 Mac:00D0.9787.0E3D TCP socket:[1] activeLine:0 UNREGISTERED

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:0.0.0.0 0 7960 keepalive 43 max_line 2

button 1: dn 2 number 7891 CH1 DOWN

Rosario#

20. Desconexión y reconexión del patch del teléfono

20.1 En switch

%ILPOWER-5-IEEE_DISCONNECT: Interface Fa0/4: PD removed (PoE)

%LINK-5-CHANGED: Interface FastEthernet0/4, changed state to down

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down

%ILPOWER-7-DETECT: Interface Fa0/4: Power Device detected: Cisco PD (PoE)

ILPOWER-5-POWER_GRANTED: Interface Fa0/4: Power granted

%LINK-5-CHANGED: Interface FastEthernet0/4, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up

20.2 En router con CME

%IPPHONE-6-REGISTER: ephone-2 IP:192.168.20.4 Socket:2 DeviceType:Phone has registered.

Rosario#sh ephone

ephone-1 Mac:00D0.FF86.DA0C TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.3 1026 7960 keepalive 43 max_line 2

button 1: dn 1 number 7890 CH1 IDLE

ephone-2 Mac:00D0.9787.0E3D TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.4 1026 7960 keepalive 43 max_line 2

button 1: dn 2 number 7891 CH1 IDLE

Rosario#

21. Trama con relay de DHCP para entender como se obtiene la MAC del dispositivo a travez de la WAN

Las direcciones MAC sólo funcionan en un ambiente local (red LAN) pero en este tipo de tráfico se envía como dato para realizar una

asociación entre la IP de alquiler y la MAC de quien la utilizará.

Frame 3 (356 bytes on wire, 356 bytes captured)

Ethernet II, Src: 00:1b:54:96:61:c2, Dst: 00:1b:77:b3:80:a5 (Trama: capa 2 modelo OSI)

Internet Protocol, Src: 192.168.10.254 , Dst: 192.168.30.1 (Paquete: capa 3 modelo OSI)

User Datagram Protocol, Src Port: bootps (67), Dst Port: bootpc (68) (Segmento: capa 4 modelo OSI, ver es UDP)

Bootstrap Protocol (DHCP: capa 7 modelo OSI)

Message type: Boot Reply (2)

Hardware type: Ethernet

Hardware address length: 6

Hops: 0

Transaction ID: 0x78cc312e

Seconds elapsed: 0

Bootp flags: 0x0000 (Unicast)

Client IP address: 0.0.0.0 (aún no tiene IP)

Your (client) IP address: 192.168.10.2 (PC en Rosario)

Next server IP address: 192.168.30.1 (server DHCP en Córdoba)

Relay agent IP address: 192.168.10.254 (router que realiza el relay)

Client MAC address: 00:1b:77:b3:80:a5 (MAC del PC en Rosario)

Server host name not given

Boot file name not given

Option: (t=53,l=1) DHCP Message Type = DHCP Offer

Option: (t=1,l=4) Subnet Mask = 255.255.255.0

Option: (t=58,l=4) Renewal Time Value = 12 hours

Option: (t=59,l=4) Rebinding Time Value = 21 hours

Option: (t=51,l=4) IP Address Lease Time = 1 day

Option: (t=54,l=4) Server Identifier = xxx

Option: (t=15,l=13) Domain Name = xxx

Option: (t=3,l=4) Router = 192.168.10.254 (gateway a utilizar por el PC)

Option: (t=6,l=4) Domain Name Server =

Option: (t=44,l=8) NetBIOS over TCP/IP Name Server

Option: (t=46,l=1) NetBIOS over TCP/IP Node Type = H-node

End Option

22. Trama completa transportando un paquete de voz sobre IP dentro del túnel en la red MPLS de TECO

Cabe destacar toda la sobrecarga administrativa necesaria para transportar el stream de audio.

23. Captura real con Wireshark de la finalización de la sesión de señalización entre el teléfono y el router con CME (Call Manager Express)

mediante el protocolo Skinny y comienzo de la conversación de audio mediante RTP (Real Time Protocol). Notar que la trama #58 anuncia

Start Media Transmission, o sea, el audio en si, mediante el codificador G.711 que proporcionará un flujo de datos de 64 kbit/s..

Las MTU tienen unl longitud uniforme de 214 bytes.

23.1 Reproducción de la comunicación off-line

24. Implementación de calidad de servicio (QoS) para VoIP (implementado en un Cisco 1760, no en Packet Tracer)

24.1 En router Córdoba

class-map match-any QoS-Datos (1) (tráfico que coincide con cualquier condición siguiente)

match access-group name Datos (ACL nombrada)(2)

match access-group name VoIP-Signaling (ACL nombrada)(3)

match ip precedence 2

class-map match-any QoS-RTP (4) (tráfico que coincide con cualquier condición siguiente)

match ip precedence 5

match access-group name VoIP-RTP (ACL nombrada)(5)

policy-map QoS-policy (3)(acciones aplicadas al tráfico declarado en los class-map anteriores)

class QoS-RTP (4)

priority percent 30 (un tercio del ancho de banda para voz)

set ip precedence 5 (etiqueta los paquetes con DSCP 5: critical)

class QoS-Datos (1)

bandwidth percent 50 (la mitad del ancho de banda es para datos)

set ip precedence 2 (etiqueta los paquetes con DSCP 2: reenvío inmediato)

class class-default (todo el tráfico que no coincide en (1) y (4))

fair-queue (cola de espera regular/normal)

policy-map Shaper-1MB (aplica calidad de servicio en Fa0/1)

class class-default

shape average 1024000 (el execedente a a 1024 Kbps se pone en buffer de espera)

service-policy QoS-policy (3)(etiqueta con precedence 3 o 5 según política anterior)

interface Tunnel0

ip address 172.16.0.2 255.255.255.252

tunnel source FastEthernet0/1

tunnel destination 10.0.0.2

bandwidth 2048

qos pre-classify (replica los campos de QoS del paquete IP original en la nueva encapsulación GRE)

interface FastEthernet0/1

description MPLS TECO

ip address 10.0.0.6 255.255.255.252

service-policy output Shaper-1MB (aplica a la salida MPLS, lo excedente a 1 Mbps queda en buffer)

ip access-list extended Datos (aplicada en class-map QoS-Datos(2))

permit ip 192.168.30.0 0.0.0.255 192.168.10.0 0.0.0.255 (aplica tráfico datos Córdoba a Rosario)

ip access-list extended VoIP-RTP (aplica a class-map QoS-RTP(5))

permit udp any any range 16384 32767 (rango de puertos utilizados por Real Time Protocol)

ip access-list extended VoIP-Signaling (aplicada en class-map QoS-Datos(3))

permit tcp any any eq 2000 (es el protocolo Skinny o SCCP para teléfonos Cisco)

25. Campos de un paquete IP con valores de QoS aplicados en una policy (ver set ip precedence)

26. Agregado de 8 teléfonos extra

Rosario#conf t

Rosario(config)#telephony-service

Rosario(config-telephony)#max-ephones 10 (ampliamos cantidad de 4 a 10)

Rosario(config-telephony)#max-dn 10 (ampliamos cantidad de 4 a 10)

Rosario(config-telephony)#no auto assign 1 to 3

Rosario(config-telephony)#auto assign 1 to 10 (ampliamos cantidad de 4 a 10)

Rosario(config-telephony)#exit

Rosario(config)#ephone-dn 3 (generamos nuevos internos)

Rosario(config-ephone-dn)# number 7892

Rosario(config-ephone-dn)# exit

Rosario(config)#ephone-dn 4

Rosario(config-ephone-dn)# number 7893

Rosario(config-ephone-dn)# exit

Rosario(config)#ephone-dn 5

Rosario(config-ephone-dn)# number 7894

Rosario(config-ephone-dn)# exit

Rosario(config)#ephone-dn 6

Rosario(config-ephone-dn)# number 7895

Rosario(config-ephone-dn)# exit

Rosario(config)#ephone-dn 7

Rosario(config-ephone-dn)# number 7896

Rosario(config-ephone-dn)# exit

Rosario(config)#ephone-dn 8

Rosario(config-ephone-dn)# number 7897

Rosario(config-ephone-dn)# exit

Rosario(config)#ephone-dn 9

Rosario(config-ephone-dn)# number 7898

Rosario(config-ephone-dn)# exit

Rosario(config)#ephone-dn 9

Rosario(config-ephone-dn)# number 7899

Rosario(config-ephone-dn)# end

Rosario#

Switch#conf t

Switch(config)#interface range FastEthernet0/5-12 (ports para nuevos internos)

Switch(config-if-range)#spanning-tree portfast

%Warning: portfast should only be enabled on ports connected to a single

host. Connecting hubs, concentrators, switches, bridges, etc... to this

interface when portfast is enabled, can cause temporary bridging loops.

Use with CAUTION

%Portfast will be configured in 8 interfaces due to the range command

but will only have effect when the interfaces are in a non-trunking mode.

Switch(config-if-range)# switchport mode access

Switch(config-if-range)# switchport voice vlan 20

Switch(config-if-range)# end

Switch#

%IPPHONE-6-REGISTER: ephone-3 IP:192.168.20.4 Socket:2 DeviceType:Phone has registered.

%IPPHONE-6-REGISTER: ephone-4 IP:192.168.20.5 Socket:2 DeviceType:Phone has registered.

%IPPHONE-6-REGISTER: ephone-5 IP:192.168.20.6 Socket:2 DeviceType:Phone has registered.

%IPPHONE-6-REGISTER: ephone-2 IP:192.168.20.2 Socket:2 DeviceType:Phone has registered.

%IPPHONE-6-REGISTER: ephone-6 IP:192.168.20.9 Socket:2 DeviceType:Phone has registered.

%IPPHONE-6-REGISTER: ephone-1 IP:192.168.20.3 Socket:2 DeviceType:Phone has registered.

%IPPHONE-6-REGISTER: ephone-7 IP:192.168.20.8 Socket:2 DeviceType:Phone has registered.

%IPPHONE-6-REGISTER: ephone-8 IP:192.168.20.7 Socket:2 DeviceType:Phone has registered.

%IPPHONE-6-REGISTER: ephone-9 IP:192.168.20.10 Socket:2 DeviceType:Phone has registered.

%IPPHONE-6-REGISTER: ephone-10 IP:192.168.20.11 Socket:2 DeviceType:Phone has registered.

Rosario#sh ephone (verificamos)

ephone-1 Mac:0003.E461.50D4 TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.3 1026 7960 keepalive 43 max_line 2

button 1: dn 1 number 7890 CH1 IDLE

ephone-2 Mac:0060.5C26.4540 TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.2 1026 7960 keepalive 43 max_line 2

button 1: dn 2 number 7891 CH1 IDLE

ephone-3 Mac:000A.41AD.7472 TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.4 1026 7960 keepalive 43 max_line 2

button 1: dn 3 number 7892 CH1 IDLE

ephone-4 Mac:00D0.BADA.DAEC TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.5 1026 7960 keepalive 43 max_line 2

button 1: dn 4 number 7893 CH1 IDLE

ephone-5 Mac:0009.7C8A.DA63 TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.6 1026 7960 keepalive 43 max_line 2

button 1: dn 5 number 7894 CH1 IDLE

ephone-6 Mac:00E0.8FCD.DD10 TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.9 1026 7960 keepalive 43 max_line 2

button 1: dn 6 number 7895 CH1 IDLE

ephone-7 Mac:00E0.A35C.C226 TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.8 1026 7960 keepalive 43 max_line 2

button 1: dn 7 number 7896 CH1 IDLE

ephone-8 Mac:0050.0F62.2DD2 TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.7 1026 7960 keepalive 43 max_line 2

button 1: dn 8 number 7897 CH1 IDLE

ephone-9 Mac:0050.0F19.5CAC TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.10 1026 7960 keepalive 43 max_line 2

button 1: dn 9 number 7898 CH1 IDLE

ephone-10 Mac:0001.9639.E937 TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 12 and Server in ver 8

mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:8

IP:192.168.20.11 1062 7960 keepalive 43 max_line 2

button 1: dn 10 number 7899 CH1 IDLE

Rosario#

Switch#sh power inline

Available:370.0(w) Used:63.0(w) Remaining:307.0(w)

Interface Admin Oper Power Device Class Max

(Watts)

--------- ------ ---------- ------- ------------------- ----- ----

Fa0/1 auto off 0.0 n/a n/a 15.4

Fa0/2 auto on 6.3 IP Phone 2 15.4

Fa0/3 auto off 0.0 n/a n/a 15.4

Fa0/4 auto on 6.3 IP Phone 2 15.4

Fa0/5 auto on 6.3 IP Phone 2 15.4

Fa0/6 auto on 6.3 IP Phone 2 15.4

Fa0/7 auto on 6.3 IP Phone 2 15.4

Fa0/8 auto on 6.3 IP Phone 2 15.4

Fa0/9 auto on 6.3 IP Phone 2 15.4

Fa0/10 auto on 6.3 IP Phone 2 15.4

Fa0/11 auto on 6.3 IP Phone 2 15.4

Fa0/12 auto on 6.3 IP Phone 2 15.4

Fa0/13 auto off 0.0 n/a n/a 15.4

Fa0/14 auto off 0.0 n/a n/a 15.4

Fa0/15 auto off 0.0 n/a n/a 15.4

Fa0/16 auto off 0.0 n/a n/a 15.4

Fa0/17 auto off 0.0 n/a n/a 15.4

Fa0/18 auto off 0.0 n/a n/a 15.4

Fa0/19 auto off 0.0 n/a n/a 15.4

Fa0/20 auto off 0.0 n/a n/a 15.4

Fa0/21 auto off 0.0 n/a n/a 15.4

Fa0/22 auto off 0.0 n/a n/a 15.4

Fa0/23 auto off 0.0 n/a n/a 15.4

Fa0/24 auto off 0.0 n/a n/a 15.4

Switch#

Cordoba#conf t (modificamos plan de dial en Córdoba, ver punto 13.)

Enter configuration commands, one per line. End with CNTL/Z.

Cordoba(config)#dial-peer voice 1 voip

Cordoba(config-dial-peer)#destination-pattern 789. (incluye internos que finalizan entre 1 y 9)

Cordoba(config-dial-peer)#^Z

Cordoba#

(2012) Scare pretty girls with networking

Rosario, Argentina