06-21-2020 01:14 AM
hello all,
I'm trying to set some things as follow: network A has a VOIP pbx, network B has cucm, and network C has a cucm also. Net A see Net B but not Net C, Net B see Net C. I have setup a sip trunk from voip pbx to net B cucm and its working fine, a sip trunk from cucm B to cucm C, and its working fine also. The question is, how can i reach from A voip to C cucm using the two sip trunks. An sip phone from A to a sip phone from C is ringing but no sound. I suppose all my rtp traffic is dropped. Any ideea why? I use 2 route patterns to get the sip trunk by the sip trunk. Thank you all
Solved! Go to Solution.
06-21-2020 07:50 AM
That’s not going to work as the trunks in CUCM B will only handle the signaling, not the audio (RTP) stream. To bridge these networks/systems together you’d need to have a voice gateway that acts as an SBC. This can be achieved with a Cisco router with Cube functionality that has a interface in network B and one in network C. On each of the systems, PBX A and CUCM C setup a SIP trunk to the SBC and configure call routing in the gateway with dial peers to connect the two systems together. With a SBC both signaling and media traffic will traverse through the router, to achieve a connection between systems and endpoints.
06-21-2020 03:09 AM
06-21-2020 06:06 AM
As i told in my post , Net A is not viasbile to C and vice-versa, so i was trying to do it by passing all the signaling and traffic via net B cucm.
06-21-2020 07:50 AM
That’s not going to work as the trunks in CUCM B will only handle the signaling, not the audio (RTP) stream. To bridge these networks/systems together you’d need to have a voice gateway that acts as an SBC. This can be achieved with a Cisco router with Cube functionality that has a interface in network B and one in network C. On each of the systems, PBX A and CUCM C setup a SIP trunk to the SBC and configure call routing in the gateway with dial peers to connect the two systems together. With a SBC both signaling and media traffic will traverse through the router, to achieve a connection between systems and endpoints.
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