[asterisk-users] Long call setup times on SIP to zaptel calls

[Eric "ManxPower" Wieling]

Mojo with Horan & Company, LLC wrote:
> One thing I've noticed with SIP -> ZAP calls for quite some time is that 
>  when asterisk is dialing n digits out the zap line, it dials n-1 
> digits, pauses for *TWO* seconds, and then sends the nth digit.  Doesn't 
> matter how many numbers I want to send out the ZAP channel, this always 
> seems to happen.
> 
> Asterisk 1.2.x is affected for sure.  I haven't tested 1.4 yet.  But if 
> we could get this figured out, that would shave two seconds off MY 
> nearly-five-second setup time.

This seems to happen with ALL dialing out non-PRI FXO ports and has 
happened since at least 1.2.0 and maybe long before that.  Irritating as 
hell because when outpulsing 11 digits to the PSTN, every second counts 
as the user gets annoyed with 11 x 300ms of silence.  Yes, the default 
for Asterisk is 100ms DTMF, but many systems don't recognize DTMFs that 
short.  As far as I know it has not been fixed.