[SIPForum-discussion] [SIP Forum-discussion] DTMF on SIP

[AMIT ANAND]

On Sat, Sep 4, 2010 at 6:42 AM, Eduardo Lobato <
eduardo.lobato at tatacommunications.com> wrote:

Hi ,

Please find the answer in line

1.How to find the DTMF option is accepting while making a call through sip
gateway ?
For this you would have to look at the signalling messages for the call,
I.e the INFO type is defined in the ALLOW header for out of band DTMF and
the parameters for INBAND DTMF are defined in SDP.

2.Is there any relation between codec and DTMF signaling?
  Yes, If DTMF is INBAND codec plays role in that,

3.Will the DTMF will get reverse? i.e if we enter the digit 1234 will it
reply as 4321?
 No, It should get delivered the way it has been generated untill if some
special algorithm is getting followed between both ends, I am not aware of
any such algo.

Hope this clrears your query,

Cheers
Amit Anand




> With SIP INFO DTMF digits are carried out-of-band (I.e. In the signaling
> stream), with INBAND the DTMF digits are carried as part of the RTP/Media
> stream as audio packets, with 2833 DTMF digits are carried as part of the
> media stream but with a different payload type and embedded digit
> indication.
>
>  ------------------------------
> *From*: discussion-bounces at sipforum.org <discussion-bounces at sipforum.org>
> *To*: Underwood, Rosa <rosa.m.underwood at verizon.com>
> *Cc*: discussion at sipforum.org <discussion at sipforum.org>
> *Sent*: Fri Sep 03 14:32:16 2010
> *Subject*: Re: [SIPForum-discussion] DTMF on SIP
>
>  Hi,
>
> I also face similar problem with Murali...Can anyone briefly explain the
> difference between SIP INFO, In Band and RFC 2833 DTMF method...
>
> Regards,
>
> Ridhuan
>
> On Fri, Sep 3, 2010 at 12:04 AM, Underwood, Rosa <
> rosa.m.underwood at verizon.com> wrote:
>
>>  RFC 4733 might be able to help you.  For background, you can refer to
>> RFC 2833, which I believe  was obsoleted by RFC 4733.
>>
>>
>>
>> *From:* discussion-bounces at sipforum.org [mailto:
>> discussion-bounces at sipforum.org] *On Behalf Of *murali shankar
>> *Sent:* Wednesday, September 01, 2010 8:57 PM
>> *To:* discussion at sipforum.org
>> *Subject:* [SIPForum-discussion] DTMF on SIP
>>
>>
>>
>> Dear All,
>>
>>             Please clarify me on the below quries
>>
>>           1.How to find the DTMF option is accepting while making a call
>> through sip gateway ?
>>           2.Is there any relation between codec and DTMF signaling?
>>           3.Will the DTMF will get reverse? i.e if we enter the digit 1234
>> will it reply as 4321?
>>
>>
>> Thanks,
>> Murali
>>
>>
>>
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>>
>
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>


-- 
Thanks
Amit Anand
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