[SIPForum-discussion] Does every Voip phone use SIP INFO to send DTMF?

Rodrigo Pimenta Carvalho pimenta at inatel.br
Mon Aug 24 18:26:42 UTC 2015


In my office I have a Voip phone. During a call with such device, whether I dial 200 for example, the phone will generate a SIP INFO message containing the value 200. Good!

Does every Voip phone send DTMF values as SIP INFO messages? Is it in general  a kind of standard in the telecommunications? Or is it a matter of some device configuration?

Any hint will be very helpful!

Best regards.

Inatel Competence Center
Ph: +55 35 3471 9200 RAMAL 979
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