Issue with B2B Calling

[aniket0422]

Hello Guys,

Facing issue with the audio/video in B2B calling.

We have DX80 and Room 55 registered on VCS Core. B2B and DNS Zones are active.

Inbound and Outbound B2B calling is also working.

Belows the inbound/outbound call Flow.

Room55 → VCS-C → VCE-E → Internet 

Room55 ← VCS-C ← VCS-E ← Internet

Problem is that in both inbound or outbound call, On Room 55 or DX80, there is no video at all and little bit of audio we can here. In call statastics we could see 90-95 % audio packet loss and no statastics for video on DX80 and Room 55.

1. Do we need RMS licenses here considering Telepresence endpoint registered on vcs core.

2. Do we need to change RTP/Video port range on Room 55 or Board 70

3. Is there any port changes required on the vcs core and edge server.

Or anything else i am missing.

Call Statastics.

Video Statistics(Call with 53810)

Transmit    Protocol: H264
Transmit    Resolution: 128x72
Transmit    Frame rate: 15.0 fps
Transmit    Packets: 691
Transmit    Total packet loss: 64.82%
Transmit    Current packet loss: 82.80%
Transmit    Jitter: 73 ms
Transmit    Channel rate: 16 kbps
Transmit    Roundtrip/latency: 25 ms

Receive    Protocol: H264
Receive    Resolution: 768x448
Receive    Frame rate: 30.0 fps
Receive    Packets: 1892
Receive    Total packet loss: 0.00%
Receive    Current packet loss: 0.00%
Receive    Jitter: 2 ms
Receive    Channel rate: 310 kbps
Receive    Roundtrip/latency: -


Audio Statistics(Call with 53810)

Transmit    Protocol: OPUS
Transmit    Packets: 2067
Transmit    Total packet loss: 96.98%
Transmit    Current packet loss: 96.80%
Transmit    Jitter: 68 ms
Transmit    Channel rate: 62 kbps
Transmit    Roundtrip/latency: 22 ms

Receive    Protocol: OPUS
Receive    Packets: 4156
Receive    Total packet loss: 0.02%
Receive    Current packet loss: 0.00%
Receive    Jitter: 1 ms
Receive    Channel rate: 38 kbps
Receive    Roundtrip/latency: -

[Nick Halbert-Lillyman]

This sounds like it's probably a firewall issue - you don't need to change the ports on VCS or the endpoints, but rather ensure all the required ports are open on the firewall between VCS-C and VCS-E, as well as between VCS-E and the internet, in both directions.

Check the firewall/port guides for your version of VCS or Expressway here: https://www.cisco.com/c/en/us/support/unified-communications/expressway-series/products-installation-and-configuration-guides-list.html

[aniket0422 · Accepted solution]

Issue has been resolved.

There was security device named Arbor placed next to perimeter Firewall which was blocking incoming UDP traffic from internet to our expressway edge.

Expressway Edge Public IP address is bypassed in Arbor and now bi-directional audio/video works fine.