2811 router configuration for SIP fall back when CCM4.1 down

[nguyen]

Hi,

I have a 2811 router with 2 E1 Pri and connected to a 4.1 CCM.

My understanding is that the link between CCM and the PRI is direct through the binding below

interface Serial0/0/0:15

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

isdn bind-l3 ccm-manager

isdn bchan-number-order ascending

no cdp enable

thus I have the feeling that the following is useless :

dial-peer voice 1 pots

service mgcpapp

direct-inward-dial

port 0/0/0:15

forward-digits all

BUT, in case the MGCP link with ccm is lost, I would like all incoming calls on E1 be forwarded to a SIP trunk

directly attached to the 2811 (and not to the CCM).

is this possible ?

thank you.

[acampbell]

Hi,

Normal working.

CUCM ----MGCP----2811--E1

For the E1 pri the dial peers are ignored under MGCP
All call control is backhauled to CUCM vis MGCP

Fall back when MGCP fails.

E1---2811---SIP

You loose the MGCP backhaul and call control is handed back to the dial peers.

You need to add

!
!
application
global
service alternate Default
!
!
!
!
dial-peer voice 1 pots
description *** FOR INCOMING CALL MATCHING ***
incoming called-number .
direct-inward-dial
port 0/0/0:15
!
!
!
!
dial-peer voice 11 voip
description *** SIP FALLBACK DIAL PEER ***
preference 1
destination-pattern 81....
incoming called-number .
voice-class codec 1
session protocol sipv2
session target ipv4:10.182.182.12
dtmf-relay sip-notify rtp-nte
ip qos dscp ef media
ip qos dscp cs3 sig
no vad
!
!

You will need to change this use your numbering scheme.
I dont know you need voice translations etc to change the numbers.
Mine shows that incoming call would be for 6 digits starting 81

HTH
Alex

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