[SIPForum-discussion] Problem DTMF

[christopher stummer]

Hi vinicio,
If there is a SBC in the middle there can be a media profile that is
stripping telephone event within the sdp.
Chris
On Feb 14, 2014 3:18 PM, "Vinicio Callejas" <vinicio.callejas at gmail.com>
wrote:

> I have a problem on an interconnection DTMF with a client which sends
> RFC-2833 (telephone-event) and our team will respond with a 183-progress
> session and 200OK message with no (telephone-event).
> THEREFORE, it is Assumed That You are INBAND dtmf. This would not be
> reliable with G729 codec.
>
> As far as i see  has RFC2833 but for some
> reason customer says did not receive the telephone-event on the 183 session
> progress or 200ok messages sent by.
>
>
> Could someone explain how to solve this problem.
>
> Very thanks,
> Vinicio
>
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