[asterisk-users] DTMF issues between Asterisk and Callmanager with Zoiper

[Carlos Chavez]

     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?

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