The Wireshark packet capture points to a problem with voip.ms. The events happened as follows:
Call comes from User-Agent: VoIPMS/SERAST with Connection Information (c): IN IP4 24.102.60.67
I answered the call on a PAP2.
About 0.11 sec. later VoIPMS/SERAST sent SIP re-invite with Connection Information (c): IN IP4 67.205.74.164.
PAP2 begins sending RTP to 67.205.74.164 and receiving RTP from 24.102.60.67.
For some reason the RTP outbound from PAP2 to 67.205.74.164 does not reach the party calling on the DID, therefore calling party hears nothing.
You should contact support at voip.ms. I can send you the packet capture if needed.
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