thread1553-1636252 Has anyone found a solution with this dead air to CDN over SIP trunks when a phone is forward to the voicemail CDN and when a Auto Attendant App is NCFW to the voicemail CDN. I have Avaya and Verizon working on this for three months already and we still do not have a fix. It is now with the Avaya Design Group
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CallPilot CDN dead Air from SIP Trunk calls
- Thread starter AELMAN
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Problem resolved
ANALYSIS : After analyzing the sniffer and SIP Debug traces, what we could understand is proper SDP negotiation is not happening over Verizon SIP trunks.
The INVITE that is coming over Verizon SIP Trunks to CS1k,does not have “100 rel” in SUPPORTED and “UPDATE” in ALLOW header of the SIP INVITE.
So, ideally in this case 183 should be forked multiple times from the CS1k over the SIP trunk. This is required to keep updating the latest DSP resources used for playing the greeting to the user. But, because PI Patch 29422 is enabled ,183 with updated DSP information is not sent.
ANALYSIS : After analyzing the sniffer and SIP Debug traces, what we could understand is proper SDP negotiation is not happening over Verizon SIP trunks.
The INVITE that is coming over Verizon SIP Trunks to CS1k,does not have “100 rel” in SUPPORTED and “UPDATE” in ALLOW header of the SIP INVITE.
So, ideally in this case 183 should be forked multiple times from the CS1k over the SIP trunk. This is required to keep updating the latest DSP resources used for playing the greeting to the user. But, because PI Patch 29422 is enabled ,183 with updated DSP information is not sent.
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