[Asterisk-Users] SIP device rings once on busy before giving busy tone with dialplan

[Chris Orme]

Hi Linus,

Thanks for pointing that out.

Luckily Asterisk has a 'billed seconds' field in the cdr which is 0 when a
number is unavailable or busy despite showing the call as 'answered'.  

A view could be taken that 0 length billed seconds calls need not be
billed with a minimum connection charge... perhaps.
Not ideal though.

I'm not sure what is the alternative as 'Answer' seems needed to get the
SIP clients attention and tell it what it should do.

Perhaps an immediate Answer before Dial worth trying.  
I'll experiment a little and the mileage of what different SIP devices
do does vary a little bit.

Thanks for replying!  Chris

On Sat, 17 Apr 2004, Linus Surguy wrote:

> > My dialplan is for the outgoing SIP call is:
> >
> > exten => _00.,1,AbsoluteTimeout(3600)
> > exten => _00.,2,Dial(${TRUNK1}/${EXTEN:2},45,r)
> > exten => _00.,3,Answer
> > exten => _00.,4,Hangup
> > exten => _00.,103,Dial(${TRUNK2}/${EXTEN:2},45,r)
> > exten => _00.,104,Answer
> > exten => _00.,105,Hangup
> >
> 
> I can't help with presenting busy to the SIP devices, but if you have the
> above on any sort of PSTN gateway you are going to annoy the PSTN users - as
> if the number selected is busy or otherwise unavailable you will still
> 'Answer' the PSTN call, causing the person calling to pay whatever call
> establishment charges/minimum charges appropriate to their tariff.
> 
> Linus
> 
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