Mitel 5610 Dect Sip w/ Mitel 5000 Can't break DTMF

[StickMan01]

I have one 5610 Dect sip phone hanging off a Mitel 5000 HX 5.1.0.8. I can make ext to ext calls and two audio is fine. When I call outside on a trunk line (copper) and I reach a business with an auto att, I can't break DTMF. I looked at some docs and tried adjusting the DTMF encoding setting to RFC 2833 and DTMF transmit level is set on North America. I have regular IP phones that don't have this issue Anyone have any thoughts? Thanks

 

[IrwinMFletcher]

I don't know the internals of the 500 that well, but my guess is either the RFC only applies to the Tx direction (which is common in implementations) or there is something wrong with the negotiation. Can you disable RFC from either the 5000 or the Dect side?

A wireshark trace would tell me the exact problem.

 

[StickMan01]

No, you can not disable...

 

[IrwinMFletcher]

Sounds odd that you can't disable it on the DECT side, the spec says it can handle both, maybe that's just in the rx direction? You would think it would be able to send in-band dtmf.

So to be clear, if you call out with that DECT set out a analog trunk line to a cell phone ans then press a digit on the Dect set, you don't hear any DTMF on the other end? The reason I ask is that there can be two issues, either the 5000 doesn't translate the RFC packets into in-band DTMF, or it does, but the resulting signal isn't up to spec.