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Mitel Forums => Mitel Software Applications => Topic started by: io on December 28, 2016, 11:21:13 AM

Title: No Audio on Softphone Calls from One Location
Post by: io on December 28, 2016, 11:21:13 AM

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?

Title: Re: No Audio on Softphone Calls from One Location
Post by: ralph on December 28, 2016, 01:23:30 PM

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

Ralph

Title: Re: No Audio on Softphone Calls from One Location
Post by: io on December 28, 2016, 01:27:57 PM

Thanks Ralph - I'll look into that.

Title: Re: No Audio on Softphone Calls from One Location
Post by: martyn on December 28, 2016, 07:43:05 PM

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?

Title: Re: No Audio on Softphone Calls from One Location
Post by: io on January 03, 2017, 08:59:42 AM

Quote from: martyn on December 28, 2016, 07:43:05 PM

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.