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Mitel Forums => Mitel MiVoice Business/MCD/3300 => Topic started by: ssherman@ecsinc.su.com on March 03, 2015, 04:38:54 PM

Title: No audio on an external call forward across Level 3 SIP trunks
Post by: ssherman@ecsinc.su.com on March 03, 2015, 04:38:54 PM

i am turning up SIP trunks with Level 3 and have everything working except there is no audio only on incoming calls forwarded to an external number. Has anyone else encountered this issue?

Title: Re: No audio on an external call forward across Level 3 SIP trunks
Post by: wiseguy on March 03, 2015, 05:05:01 PM

I've seen this at a customer. The SIP provider had to change something on there SBC to make it work. In that case the SIP trunks were connected without an MBG and the streaming should be done at there SBC.

Title: Re: No audio on an external call forward across Level 3 SIP trunks
Post by: ssherman@ecsinc.su.com on March 03, 2015, 05:14:08 PM

This is with an MBG in the DMZ. We had firewall issues to begin with , but have straightened that out. The provider is stating it is not their issue. Transferring externally is fine. The issue is only on forwards.

Title: Re: No audio on an external call forward across Level 3 SIP trunks
Post by: ssherman@ecsinc.su.com on March 11, 2015, 01:13:45 PM

Turns out this was a firewall issue.

Title: Re: No audio on an external call forward across Level 3 SIP trunks
Post by: sunspark on March 05, 2020, 11:37:52 AM

Quote from: ssherman@ecsinc.su.com on March 11, 2015, 01:13:45 PM

Turns out this was a firewall issue.

hello , i have the same issue , do you remember what was the issue ? thanks.