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SIP TRUNK with MGCP Gateway



Anyway of setting up a sip trunk on a 3845 MGCP gateway?

I want to be able to put some calls over the sip trunk and some of the E1 via MGCP.

Do i need to drop MGCP and configure it for H323 to get this working?

Thanks in advance..

25 Replies 25

Hi clougher01 


I'm in the same problem, my topology:


CUCM -> sip trunk -> CME -> sip trunk -> ITSP


When I Answer the call is hang up.


My config is 


dial-peer voice 67 voip
 description ** SIP trunk ITSP**
 destination-pattern 591[67].......
 session protocol sipv2
 session target ipv4:
 session transport udp
 voice-class sip early-offer forced
 codec g711ulaw
dial-peer voice 68 voip

 description ** SIP trunk CUCM**

 session protocol sipv2

 answer-address .T

 session target ipv4:
 voice-class sip early-offer forced
 codec g711ulaw



I Have SIP to SIP and the CUCM configured.


bind media source-interface GigabitEthernet0/0 (CME to CUCM Iface)



Do you guide me?




I have same scenario.. but now I have to replace PRI with SIP Trunk..
So do I need to remove MGCP configuration.. I think yes.. because MGCP configuration.. this architecture will not support.. and I need to create H.323/Dial peer like architecture..

Any view.. to top up SIP over MGCP..

Is there is any way to assign priority between SIP trunk and MGCP, if my sip trunk goes down then the all call originating from the cucm routed through MGCP endpoint

Try configuring a Route group having SIP Trunk on primary and MGCP endpoint in secondary. Use Top-Down algorithm. 

Sure sir I'll try it, I have planned service downtime on coming Saturday, 29 July 2023

You don't need a downtime just to configure a route group / route list in CUCM^^

Yes correct but in my case the SIP TRUNK is directly pointed as gateway in
route pattern, i think while removing SIP trunk from the route pattern the
services might affect.

Very short impact. Simply create the RL and RG, then change the destination on the route pattern(s). Once you done that go back to the RG and add the SIP trunk. All in all this should only affect service for a quite short period and only for calls made during that period.

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We have tested with RL & RG configuration the all works well but unable to
transfer calls to MGCP PRI when SIP PRI is down

As I wrote on your post you do that within CM with either the route group, with top down processing set, or in the route list if you put two RGs in it, with the RG with the SIP trunk as the first option and RG with MGCP posts as second option in the RL.

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