Mitel 5610 Dect Handsets and SIP trunking...

[VanillaJ]

We installed a SIP trunk for one of their clients yesterday and are having some strange issues with the 5610 dect handsets. When using these handsets to call via the sip trunk the audio quality is really bad and jitters permanently, but when using a normal handset the audio is perfect.

I’ve replicated the issue in our office so it’s not isolated to the clients environment. Sounds like a codec issues to me but I’ve tried a few setting on the base station but nothing makes a difference.

Any ideas?

 

[LoopyLou]

And calls from the 5610 to any device but the SIP trunks are ok?

The single biggest problem with communications is the illusion that it has taken place.

 

[VanillaJ]

Yes internally it's fine and phoning via the ISDN lines with the 5610 is also fine.