[Standards] XEP-0181 (Jingle DTMF) and RFC 4733

[Paul Witty]

When negotiating DTMF using RFC 4733, there are some parameters to 
specify, for which there is currently no support in XEP-0181.  As with 
other RTP formats, a dynamic payload type and clock rate must be 
specified.  A list of supported events can also be supplied, but this 
seems unnecessary, and assuming the default (0-9, #, *, A, B, C and D) 
should be fine.

I propose that the negotiation of the DTMF method should be either, for 
XMPP-style:
<iq from='juliet at capulet.com/balcony'
    id='dtmf2'
    to='ivr.shakespeare.lit'
    type='set'>
  <jingle xmlns='urn:xmpp:tmp:jingle'
          action='session-info'
          initiator='juliet at capulet.com/balcony'
          sid='a73sjjvkla37jfea'>
    <dtmf-method xmlns='urn:xmpp:tmp:jingle:dtmf' method='xmpp'/>
  </jingle>
</iq>

or, for RTP:
<iq from='juliet at capulet.com/balcony'
    id='dtmf2'
    to='ivr.shakespeare.lit'
    type='set'>
  <jingle xmlns='urn:xmpp:tmp:jingle'
          action='session-info'
          initiator='juliet at capulet.com/balcony'
          sid='a73sjjvkla37jfea'>
    <dtmf-method xmlns='urn:xmpp:tmp:jingle:dtmf' method='rtp'>
      <payload-type id='100' name='telephone-event' clockrate='8000'/>
    </dtmf>
  </jingle>
</iq>

-- 

Paul