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

[Jim DeVito]

It is a configuration setting on the SIP device. AND an inter-op issue 
with your provider. I would say most providers require RFC2833 / 4733

---
Jim DeVito
Mobile 440.941.3860

On 2015-08-24 14:26, Rodrigo Pimenta Carvalho wrote:
> Hi.
> 
> 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.
> 
> ​RODRIGO PIMENTA CARVALHO
>  Inatel Competence Center
>  Software
>  Ph: +55 35 3471 9200 RAMAL 979
> 
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