Phone ATA187 not working with fax and DTMF

jfernandorosa · ‎08-28-2013

Dear Experts.

I have a problem with cisco ATA187 and SIP ISP, DTMF and Fax not working together.

Scenario:

CUCM9.1 -->ATA187 --> SIP TRUNK -->CUBE-->SIP ISP.

ATA187 -> DP-G711 -> MTP SIP TRUNK uncheck -> Fax ok -> DTMF no ok.

ATA187 -> DP-G729 -> MTP SIP TRUNK check -> Fax no ok -> DTMF ok.

ATA187 -> DP-G711 -> MTP SIP TRUNK check -> Fax no ok -> DTMF no ok -> Call Problem.

I need the dtmf and Fax working together.

Thanks for help!

John.