[Asterisk-Users] DTMF tones not long enough on out going call s

[Low, Adam]

Hmmm, interesting I was not aware of this. My experience evolves from voice switches (Nortel DMS, Lucent EXS) rather than PBX's. I am using inband DTMF within my setup as I had problems (no DTMF recognition on PSTN calls) with RFC2833 when dialing through an AS5300 and onto a DMS100.

What is the reason for this? Is the PBX actually cancelling out the DTMF tone after it itself recognises the tone? Does it also effect the DTMF tones received over a B channel from the PSTN?

-----Original Message-----
From: Adam Roach
To: 'asterisk-users at lists.digium.com'
Sent: 22/08/03 20:08
Subject: RE: [Asterisk-Users] DTMF tones not long enough on out going call s

I'll point out that the same applies in general to many
commercial PBXes. I can verify from years of personal
experience, for example, that the Ericsson MD110 (probably
the most popular PBX in Europe) exhibits precisely
the same behavior.

/a

> -----Original Message-----
> From: Eric Wieling [mailto:eric at fnords.org]
> Sent: Friday, August 22, 2003 11:17
> To: asterisk-users at lists.digium.com
> Subject: RE: [Asterisk-Users] DTMF tones not long enough on out going
> call s
> 
> 
> Have someone using a SIP device with RFC2833 signaling call you, now
> have the press and hold down one of the dialing keys.  You'll hear a
> short tone then nothing.
> 
> On Fri, 2003-08-22 at 11:05, Low, Adam wrote:
> > Maybe its just me but I find this question a little 
> confusing, the tone duration should have no impact on tone 
> recognition and typically in my experience the duration of 
> the tone is defined by how long the user holds down the button !?
> > 
> > > -----Original Message-----
> > > From: James Sizemore [mailto:james at deny.org] 
> > > Sent: 22 August 2003 17:33
> > > To: asterisk-users at lists.digium.com
> > > Subject: [Asterisk-Users] DTMF tones not long enough on out 
> > > going calls
> > > 
> > > 
> > > DTMF tones are not long enough on out going calls, when I'm 
> > > using either 
> > > "info" or rfc2833. Does anyone know if the tone length value 
> > > is in rtp.c 
> > > or chan_sip.c ?
> > > 
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> > > 
> > 
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