[Asterisk-Users] How to avoid collect calls on ISDN BRI trunks?

[Dhennys Pestana]

That's exactaly the idea!
Make it work like E1 trunks with R2 signalling (Brazil) and do
'double-answering'.
If it's not possible to do with CAPI channels, I'll have a lot of trouble to
change all my AVM cards for HFC (or Intel537) ones, so I can use ZAP... :/
-Dhennys


----- Original Message ----- 
From: "Julio Arruda" <jarruda-asterisk at jarruda.com>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users at lists.digium.com>
Sent: Tuesday, July 12, 2005 9:05 AM
Subject: Re: [Asterisk-Users] How to avoid collect calls on ISDN BRI trunks?


Dhennys,
I would expect that the ISDN collect call would have some kind of
notification about the charge.
In E1/R2, the Telebras standard in fact DOES have this notification
defined, from what I remember, the problem was that many of the CO
switches would not support it, that is why the 'double-answering' is
used in most if not all the cases (there is a condition where the
double-answering would tear down any call, something to do with the
configuration in the PSTN switch).
I don't think you can answer/hangup/answer a call in ISDN the way you
can in E1/R2 or analog lines...