DTMF Issues Between Asterisk And Callmanager With Zoiper

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I had an old Asterisk installation die recently and we decided to upgrade to Asterisk 13 to replace the old server. Everything seems to be working with PJSIP but there is one issue. Asterisk talks to a callmanager via a SIP trunk and send calls to PSTN (another country).
Most of the calls that go through there are for conferences. Desk phones can enter the conferences without any issues but users with softphones like Zoiper cannot. The conference systems either duplicate digits or drop some. I have tried using inband, info and rfc4733 but the softphones always have the same problem.

Anyone has any experience with softphone dtmf issues?


Telecomunicaciones Abiertas de México S.A. de C.V. Carlos Chávez
+52 (55)9116-91161

One thought on - DTMF Issues Between Asterisk And Callmanager With Zoiper

  • Carlos Chavez wrote:

    While I can’t say I’ve had problems I can say you might want to try to narrow things down a bit. Do testing strictly to Asterisk first using something like Read and see if that is fine. If so then you’ve narrowed it down to the outgoing side, which may mean that the length of digits or something else produced by the softphone is not liked by it.

    Cheers,