No Audio on Softphone Calls from One Location

[io]

We have one location that connects to our network via VPN. About a month ago, calls involving this location stopped being able to send or receive audio from softphone users. As an added plot twist, if the softphone user places the call on hold, the audio connection is established afterwards. I've already had our network admins monitor traffic and review firewall settings - the issue persists at this specific location only. Any thoughts on this?

[ralph]

Firewall on the PC perhaps?
You may have to put Wireshark on the PC and watch to see what happens.

Ralph

[io]

Thanks Ralph - I'll look into that.

[martyn]

Is the traffic being NAT'd? What changed at the time that it stopped working? When they monitored the traffic did they see RTP in both directions?

[io]

Is the traffic being NAT'd? What changed at the time that it stopped working? When they monitored the traffic did they see RTP in both directions?

Our network team is claiming that nothing changed. I believe the location is behind a NAT. I'll see what else I can learn.