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One way audio over IP Networking on Mitel 3300.

One way audio over IP Networking on Mitel 3300.

One way audio over IP Networking on Mitel 3300.

I have an issue with one way audio that maybe someone has come across before.. I have IP networking between two 3300s sites which works ok internally calls go across and all is ok, two way audio, until an external SIP call comes in and goes across the IP networking to a user on the other system, then I get one way audio.. i.e. the external caller can hear the user ok but the internal user cant hear them.

I can route an external caller across the ip networking and breakout ok at the other side ok, two way audio.. So I just don't know why when the external caller wants an to talk to a user at the other side I get one way audio.

If I route the external caller over the backtoback E&M trunks and the Mitel 3300 (E&M trunks) holds the call all works ok. two way audio between the external caller to the user at the other side..

any help appreciated.

RE: One way audio over IP Networking on Mitel 3300.

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)

and dont forget with Mitel voice is peer to peer from the endpoints , its NOT proxied via the controller unless TDM trunks are being used
- this means the handsets need to have a Gateway address that allows the return traffic to reach the SIP trunk

If I never did anything I'd never done before , I'd never do anything.....

RE: One way audio over IP Networking on Mitel 3300.

Agree with Billz66 - most likely a routing issue.
The other thing to keep in mind is on your SIP proxy make sure to add your remote networks.
Same thing if you are on MiVB 9 or any vMiVB release.

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