[asterisk-dev] Exchange data between channels at the time of a Dial

[Christian Richter]

Hi Ricardo,


Ricardo Monteiro wrote:

> Hi,
>
> I’m new to Asterisk development, I’m in my first steps...
>
> I’m having problems to find detailed information of some of the 
> internal mechanism of this great software, I can see that are some 
> effort in place but not yet a full documentation (which is normal, I 
> would say).
>
> What I would like to know is the right way to pass some data I have on 
> the zap channel side (chan_zap.c) to the SIP channel when the Sip 
> channel is dialed from a Zap channel. What is the correct mechanism to 
> use? Is it possible using pbx_builtin_setvar_helper() and 
> pbx_builtin_getvar_helper() functions?
>
Yeah, this is a good dircetion. The channelvariables are passed from the 
originating channel to the destination channel by app_dial.

> Thanks for any tip that can push me in the right direction.
>
> BTW, what I’m trying to do is to accomplish the following (as I stated 
> on a message on the asterisk.org forum but with no help so far):
>
> I'm trying to pass user-user information from a PRI call setup to a 
> SIP INVITE, and vice versa (Probably I will add the info to the SDP).
>
> I confirmed that the information is available on the libpri, and I 
> believe it is also available on the chan_zap but have not yet 
> confirmed this last point at runtime.
>
> My question is how I can pass this information on a bridged call from 
> the Zap channel to the SIP channel. What mechanisms are available on 
> Asterisk to do this kind of things?
>
well i think the channelvariables are the most flexible way to do this, 
you can of course hack asterisk and add a user-user field to channel.h 
and fill it by chan_zap, copy it by app_dial and read it by chan_sip and 
vice versa.

> Thanks in advance for any help,
>
> Ricardo
>
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