[codec] #5: Mention DTMF in requirements

"codec issue tracker" <trac@tools.ietf.org> Thu, 25 March 2010 22:44 UTC

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Subject: [codec] #5: Mention DTMF in requirements
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#5: Mention DTMF in requirements
 Reporter:  hoene@…                 |       Owner:     
     Type:  defect                  |      Status:  new
 Priority:  major                   |   Milestone:     
Component:  requirements            |     Version:     
 Severity:  Active WG Document      |    Keywords:     
 >> - mention DTMF in requirements
 > [MEK] some simple talk-off tests should be done to determine if
 > in-band DTMF (and potentially other call progress tones) are carried
 > in-band without sufficient degradation as to cause a DTMF detector
 Definitely agree here; that was an omission from the current draft. More
 precisely, we should probably select a minimum bit-rate after which DTMF
 should be handled. I'm not sure we want to mandate that DTMF work down to
 6 kb/s, but at 20 kb/s it should definitely work. Where we put the bar is
 an open question.

 Below that boundary, it might be needed to use DTMF payload format.

Ticket URL: <http://trac.tools.ietf.org/wg/codec/trac/ticket/5>
codec <http://tools.ietf.org/codec/>