I'm using a SIP trunk from Broadview with a phone system from a company called Vertical Communication. Their solution is called Wave IP. Since install we've been dealing with a random problem involving one-way audio. It is always the same, the audio goes outbound but there is no audio inbound.
Some days we have 0-1 problems and other days i feel about 5-10%+ of the calls have this problem. We've had other issues but have worked though them. This one remains.
I'm doing wireshark captures looking at the SIP and RTP traffic. The wireshark is a mirror of all data coming in/out of the router going to the ISP SBC site. The IPs, Ports, and overall call look identical besides timestamp and ports when i compare good to bad calls. Sometimes this happens so much it is easy for me to replicate with a few test calls.
Does anyone have any suggestions for troubleshooting? I feel i need to learn something more myself. I've been working with Vertical and the SIP provider Broadview.