Re: [codec] #7: Providing DTMF Testing Tools and Samples

"codec issue tracker" <trac@tools.ietf.org> Sat, 10 April 2010 05:40 UTC

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Subject: Re: [codec] #7: Providing DTMF Testing Tools and Samples
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#7: Providing DTMF Testing Tools and Samples
------------------------------------+---------------------------------------
 Reporter:  hoene@…                 |       Owner:     
     Type:  task                    |      Status:  new
 Priority:  minor                   |   Milestone:     
Component:  requirements            |     Version:     
 Severity:  Active WG Document      |    Keywords:     
------------------------------------+---------------------------------------

Comment(by hoene@…):

 [Raymond]: We can use real-world recorded DTMF signals if we want to, but
 we don’t have to. Yes, in our DTMF testing of BV16 we used a DTMF
 generator software to generate the waveform of 20,000 random DTMF symbols
 for each of 24 DTMF test conditions, for a total of nearly half a million
 DTMF symbols. After passing through the codec, the DTMF signals were
 passed through a PC executable program which simulated a DTMF decoder that
 was widely deployed in commercial VoIP applications. The decoded DTMF
 symbols were then compared with the original DTMF keys used to generate
 the symbols to calculate the error rates. As you can see, such a test
 method is purely based on software and can easily be duplicated by third
 parties.  If the codec WG decides not to do anything with DTMF, then
 obviously nothing further needs to be done, but if the WG decides that the
 codec candidate needs to be tested for DTMF pass-through, I will try to
 dig up our DTMF test software package and get internal approval to donate
 it to IETF for this purpose.

-- 
Ticket URL: <http://trac.tools.ietf.org/wg/codec/trac/ticket/7#comment:3>
codec <http://tools.ietf.org/codec/>