[asterisk-users] Asterisk not reading fast DTMFs, was: PBX -> PRI -> * -> Telco not working

Hakan C ella4ever at gmail.com
Wed Nov 19 04:08:42 CST 2008


Did you try "relaxdtmf = yes" in your Zaptel/DAHDI conf?

On Wed, Nov 19, 2008 at 11:46 AM, Mikel Lindsaar <raasdnil at gmail.com> wrote:

>      I plug the NEC back straight to the Telco and all works well again.
>> I just got on the phone to Digium and we've raised a ticket with some pri
>> intense debugging going on. I'll update the list on findings.
>> On Wed, Nov 19, 2008 at 10:32 AM, Brent Davidson <
> brent at texascountrytitle.com> wrote:
>> I have a weird thought...  Is the PBX possibly passing the digits both
>> inband and via PRI signaling so Asterisk is getting two digit streams at the
>> same time and totally freaking out?
> You know.. that is probably it....
> What the NEC system is doing I think is when you pick up the POTS phone to
> dial, you go to the NEC's LCR program (least cost routing).  It then reads
> the first digits of your call.
> When it determines how to route your call (in our case, we have made it
> route everything out to the PRI) it then must send the digits out via
> PRI signaling.
> Maybe it captures three digits before deciding what to do, so it sends them
> out via PRI signaling.
> It would also capture the remaining digits and send them too via
> PRI signaling, but then the analog phone is ALSO sending the remaining
> digits via inband audio and then asterisk gets the first three via
> pri signaling, and the last 5 via inband, and instead of putting the
> pri signaling first and the inband second, is interleaving it.
> This must be how the Telco actually managed to router the call.  Because it
> must go 'pri signaled digits first, inband second'.  Because if you take the
> pri signal digits (which we assume are the first three) and put them at the
> start, you can see the number, all in the correct sequence.
> Thanks for this idea, I'm going to send it off to Digium and get it added
> to the ticket.
> Mikel
> --
> http://lindsaar.net/
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