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One way audio on external calls mitel 3300 - Mitel ...
https://www.tek-tips.com/viewthread.cfm?qid=1700016
In the case of SIP trunks once the call is setup by the controller then all audio goes from the sets to the SIP trunk gateway. This can be an MBG or a device supplied by the SIP trunk provider or simply might be your internet firewall. Many times firewall issues result in one way audio. Have the trunks every worked properly.
One-way Audio - Mitel
https://productdocuments.mitel.com/doc_finder/UG/EN/MiCloud/2.0/Content/MiVBG/OneWayAudio.htm
Description This alarm indicates a set has experienced one-way audio and MBG detected impairments in the call. The event is mainly logged to correlate detection with customer complaints. Alarm Status None Possible Cause Corrective Action A network or firewall configuration issue. Persistent cases are usually due to a misconfigured firewall.
One way audio over IP Networking on Mitel 3300. - Mitel ...
https://www.tek-tips.com/viewthread.cfm?qid=1795195
1 way or no audio is nearly always routing or ports being blocked make sure all voice networks can route to from the sip trunk address if its via a MBG then all handsets at all sites should be able to reach the internal address of the MBG all voice networks should be set in local networks ( allows a return path)
One-way audio when SIP calls get transferred from Mitel ...
https://www.tek-tips.com/viewthread.cfm?qid=1692148
The 3300 is set up to variable not fixed packet rate. The audio is one-way out of Nupoint, Nupoint receives no audio from the caller but the caller receives audio from Nupoint. The Nupoint is on the same subnet as the 3300 and the phones. We tried to set the SIP IP address in Nupoint but we can't figure out which IP Address Skype is using.
no way audio on mitel mbg - VoIP Forum - Spiceworks
https://community.spiceworks.com/topic/522103-no-way-audio-on-mitel-mbg
mitel ip phones--->mitel3300 controller--->mitel mbg------>sip provider. scenario 1: direct inbound call to a ddi/phone behind the mitel controller works fine with two way audio. scenario 2; inbound call to a ddi/phone that has a call fwd to a mobile does not work. i get no audio at all and the call disconnects after sometime.
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