No Audio on outbound call

[anthonyfear]

Hi All

We have uc520 with two sip dial peers that connect to local sip gateway device.

Configuration :

dial-peer voice 202 voip

destination-pattern 8T

session protocol sipv2

session target ipv4:192.168.4.4

session transport udp

dtmf-relay rtp-nte sip-notify

codec g711ulaw

no vad

!

dial-peer voice 203 voip

destination-pattern 7T

session protocol sipv2

session target ipv4:192.168.4.4

session transport udp

dtmf-relay sip-notify

codec g711ulaw

no vad

Incoming calls work fine from sip device to UC520

dial-peer 203 works fine for outbound calls. But dial-peer 202 rings out but then loses audio when connection answered.

I thought it had to be a config problem on sip device BUT if i replace UC520 with my old 1760 CME - it works!

Both dial peers are configured same on sip device - so problem is in config on UC520 - but can't figure out where?

Any ideas on how to debug this issue?

Thanks in advance

[anthonyfear]

Update:

Tried all sorts to rectify this but eventually did a "debug ccsip all" and could see that audio stream was failing when call was answered.

Finally figured out it was happening because gateway device was issuing reinvite and that was failing to get through to CME.

Still not sure how to fix this (I guess it`s probably a firewall / nat issue) but I configured gateway not to reinvite and outbound calls now work.