[SIPForum-discussion] RFC 2833 RTP Event

[amit]

Hi Onur,

you are right easy to decode the digit from the incoming RTP  packets.
But i am not able to capture these RTP packets.

How I can capture these Packets Help me

Thank you in advance.
     
       Amit  



On Wed, 2007-06-20 at 13:21 +0300, Onur Cinar wrote:

> 
> Hi Amit,
> 
> Actually if you take a look at the RFC 2833 you should be able to
> easily decode the digit from the incoming packets. The payload is 32
> bits:
> 
> 8 bits  for event
> 1 bit  E flag
> 1 bit  R flag
> 6 bits volume
> 16 bits duration (in ms)
> 
> The first 8 bits hold the digit that you are looking for. Take a look
> at section 3.10 for the values.
> 
> Although you are only interested in the digits,
> take E flag in to account as well in order to make sure that you won't count the same digit more than one time. 
> 
> Regards,
> 
> -onur
> 
> 
> 
> 
> 
> ---
> Visit Nuvoiz.com for our SoftPhone Solutions!
> A. Onur Cinar - Istanbul Office Manager
> www.nuvoiz.com
> 
> 
> 
> On 6/20/07, amit <amit.v at pyronetworks.com> wrote:
> 
>         
>         
>         Hi All,
>         
>         I would like to read the specific DTMF digit from the received
>         RTP Event. At the moment I detect that there are DTMF tones
>         (RemotePayloadChangeEvent -> Payload 101), but I have no idea
>         to receive the "RFC 2833 RTP Event", that I see in my Ethereal
>         Capture. If I have this Event I think I can extract the Event
>         ID... 
>         
>         I would be pleased to see some ideas or helpfull code
>         fragments how to receive this RFC 2833 RTP Event.
>         
>         Thank you in advance.
>         Amit 
>         
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