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No Inter-Cluster RTP Stream with Gatekeepers


Firstly I am no expert in Cisco telephony as we have just recently migrated to a full Cisco solution, so apologies if I ask a fundamental question.

Client A = Site A

Client B = Site B

Client C = Site C

Site A and Site B are in 1 cluster

Site C is in another cluster

Intra-Cluster Traffic Works

Client A -> Client B within the same cluster (across 2 sites with a low latency link) RTP stream comes up and the call functions as expected.

Inter-Cluster Traffic Fails (GK to GK)

Client C -> Client A this works, the RTP stream comes up and the call functions as expected.

Client A -> Client C this call connects but there is no RTP stream.

We are using G711 across the board and I have captured a wireshark capture from a Client A -> Client C failed call.

I have been going through this capture and noticed that when I search H225 (for the gatekeepers) I see the following –

CS: setup

RAS: admissionRequest

RAS: admissionConfirm

CS: callProeeding

CS: alerting

CS: notify

RAS: registrationRequest

RAS: registrationConfirm

CS: notify

CS: connect

CS: notify

CS: releaseComplete


RAS: disengageConfirm

There are firewalls inbetween and these were the first thing I looked at, but I dont even see any RTP stream trying to be initiated from the far side. Would anyone have any ideas where I could start looking?



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