[asterisk-users] Overlap SIP dialing

[Andrew Latham]

On Thu, Sep 8, 2011 at 9:38 AM, Kevin P. Fleming <kpfleming at digium.com> wrote:
> On 09/07/2011 11:06 AM, Daniel Tryba wrote:
>
>> The aim of the quest for overlap dialing is to let the user enter a
>> number at their own pace but immediatly dial when all digits are
>> received (just like plain old ISDN does). My trunk is a bunch of E1 PRIs
>> in overlap mode. The following just works for any SIP client (without
>> overlap dialing):
>> exten =>  _X.,1,Answer()
>> exten =>  _X.,n,Dial(${TRUNK})
>
> Unless I'm mis-remembering, this was the point of adding the '!' dialplan
> match character. If you use _X!, and you have your SIP endpoints configured
> to send an INVITE as soon as the user has entered two digits (and you have
> no other patterns in the context that could match), then the dialplan will
> match against that and initiate a Dial() on your ISDN PRI. Since the number
> is not yet complete, the SETUP message on the PRI won't result in the call
> proceeding, and as the user of the phone presses additional digits they'll
> be sent to Asterisk as DTMF, bridged over to chan_dahdi, and it will send
> them as INFORMATION messages rather than as DTMF digits, because it knows
> the outbound call is still in 'dialing' state.
>
> However, this is still going to 'mess with CDRs' as you put it, because the
> only switch in the network that knows the complete number that was dialed is
> the PSTN switch that your PRI is connected to. It seems possible that
> chan_dahdi could 'update' the EXTEN on the current channel as the additional
> digits are dialed so that the CDR contains the complete number, but I have
> no idea whether it does or not.
>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> Check us out at www.digium.com & www.asterisk.org

Exactly Kevin.  I remember now that I was using it for my
http://etel.wiki.oreilly.com/wiki/index.php/Asterisk_Man_in_the_Middle
in some setup/testing.

-- 
~ Andrew "lathama" Latham lathama at gmail.com http://lathama.net ~