[cisco-voip] Consult Transfer over SIP trunks over Multiple Gateways

[Cheng, Karen]

Hey guys,

I have a weird one.

1 CUCM cluster 7.1.2
3 Voice gateways - 3845's
1 SIP trunk per gateway

External Party 1 ISDN --> Voice Gateway 1 --> SIP Proxy --> CUCM --> Phone

Call gets connected and two way audio.

While still connected the Phone makes a consult transfer to an external number.

Phone --> CUCM --> Voice Gateway 2 --> ISDN External Party 2

While the phone is connected to the external party two way audio is still working.

Phone completes the transfer and external party 1 is connected to external party 2.

I seem to get either 1 way audio or no audio whatsoever.

I've made sure IP Routing is on the voice gateways, hard set the codec just in case it was causing problems, enabled voice rtp send-recv, have allow-connections sip to sip enabled.

The same scenario but with a Direct Transfer instead works perfectly everytime.

Does anyone have any ideas?

Appreciate any help.

Karen Cheng
Voice Network Engineer


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