RTP Packets Not Relayed Over 2nd NIC on BSS to UA

[dwood]

1. Brekeke Product Name and Version:
3.16.4.9, Standard

2. Java version:
11.0.23

3. OS type and the version:
Windows 10 Enterprise

4. UA (phone), gateway or other hardware/software involved:
Genetec SIP (Ozeki VoIP SIP SDK, content-type: application/sdp) UA (10.x.x.x) -> BSS (has two NICs)-> AXIS Network Audio Amplifier (UA) (128.X.X.X - private network)

5. Your problem:
RTP packets from the upper UA (on 10.x.x.x network) going to BSS aren't relayed over the 2nd NIC (on the BSS) to the destination UA on the 128.x.x.x network. BSS is configured with thru registration. Lower UA register fine with BSS and with the upper SIP server. Wireshark shows the rtp packets from the upper UA go to the BSS but don't make it to the lower UA.

RTP configuration:
RTP relay: on
RTP relay (UA on this machine): auto
Port mapping: have tried both sdp and source port
Send UA's remote address: have tried both yes and auto

[james]

Do you open the RTP port range at Windows firewall?
In the default, the RTP port range is UDP 10000-10099.

[dwood]

I can't believe it was that easy. I was thinking I'd see the packets rejected if there was a firewall issue. I opened the port range configured in the RTP settings and that fixed it.

Thanks a ton... I really appreciate it.