Cluster C talks to A no problem, except one remote site, in cluster C ( it cannot make a call to anyone in Cluster A) it is a reordertone. I have checked Ip connectivity and I know that the trunk is working and that there is IP connectivity between the server and its clients on both cluster.
I have route patterns reflected in both directions.
I am aware that I do not have IP connectivity between my end devices (phones in cluster C and any end devices in cluster A (ip phones).
but I would have expected to hear the phone ringing but to have rtp issues.
Is it not the case that the call setup is done by the Subscribers? in which case i do have Ip connectivity.
your understanding is correct, the basic steps to determine if the issue is signaling or media is that if you get ring tone and the other phone is indeed ringing at least signaling is fine, if when you pickup the call it fails then you start thinking media, codecs, RTP routing, etc
Make sure to include as many IPs from the other cluster in the ICT on both ends.
I guess you already tried resetting ICT on both ends, if still no avail you might need a CUCM trace
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