Abnormal disconnect when calls forwarded to vm on busy or noan

Question

Avaya S8700 <> h.323 trunk group <> CCME 4.0.3
Inbound calls over IP trunk disconnect when forwarded to AIM-CUE upon noan or busy. No problems observed when call is answered. Nor are there issues with inbound calls to same number placed over POTS line. Has anybody experienced similar issues with Avaya / Cisco operability?

Answer 1

Hi Thomas,
I am pretty sure that this a transcoding issue,especially seeing that calls routed through the POTS line are working properly have a look;
Codecs and Transcoding
Cisco Unity Express supports only G.711 voice streams, so all calls made into the system (including those from IP phones, PSTN gateway ports and any other VoIP equipment in your network) must use G.711 if they enter the AA or voice mail pilot numbers that terminate on Cisco Unity Express.
If you require that G.729A calls traverse IP segments of your network between sites, and that these calls forward or dial direct into Cisco Unity Express AA or voice mail, then you must use a transcoding resource collocated with Cisco Unity Express to change the voice stream from G.729A to G.711 before the voice stream enters the AA or voice mail pilot numbers.
From this doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps5520/products_implementation_design_guide_chapter09186a00804993c0.html#wp1011776
Hope this helps!
Rob
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