[asterisk-users] Rapid DTMF missing digits

[Bryan Laird]

Version 1.4.2 but to be honest I have no reason at all to suspect  
that this is a problem with the asterisk software.

	I've able to replicate this from a few different "client" net  
connections and a across a few different linksys ata's.  Where when  
you call into the
host and enter the extension to connect to you miss the last digit of  
the extension.  Almost every time you miss the last digit of the  
extension
(in a 4 digit extension).  My suspicion is simply because of the  
network we are currently using to host the asterisk box, as a packet  
dump on the
lan segment clearly showed that the ATA transmitted all digits  
(rfc2833) but the asterisk host only recieved 3 of the 4.  The second  
you dial
slower everything works fine; also the lines for "voice" are clear  
with no noticeable impairments.  I'm more curious if anyone else has  
ever run
into a similar problem and what the resolution was if they found one  
(IE a sturdier net connection for the asterisk host),  or Tweaking  
the timers
on the ata's to slow down how fast and how long they transmit  
digits.  I've done a few different tests and if I use a 'softphone'  
dialing directly into
the server things work perfectly.  I can dial as fast as I want,  
however when I come in through the pstn trunks through the upstream  
provider I find this problem.

has anyone else ever seen this?  Or seen a case where mis-matched  
dtmf modes across multiple providers causes this problem?

minor detail on what I referred to as the 'pstn trunks' I have no  
analog or digital circuts all handoffs are sip.


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Bryan Laird
Saving Lost Packets since 1994
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