[Asterisk-Dev] Help needed for custom application

[John Todd]

>Hi folks,
>I've been tasked with writing a very special application for Asterisk which is
>needed for a very special project (I have no idea whether I may give out
>details, so I'll stay on the safe side and won't). Since I still have
>difficulties in understanding the Asterisk internals I thought I could try
>asking the people who probably know the most about Asterisk :-)
>
>Just so you don't get me wrong, I don't want you to develop that application
>for me, I just need some hints at how to do it.
>
>The application I need to develop (let's call it fdial) can be described as a
>forking dial application (which only needs to support SIP). It should act
>almost like a normal dial at first, but when a special control frame arrives
>from a channel it should dial to a second address, and when the call is
>established the voice streams should be sent to both destinations (and vice
>versa, but not between the two destinations. So the voice stream is forking
>to two destinations. One of the established destination channels may then be
>hung up (obviously at least one destination channel must be up, otherwise we
>have a normal hangup).
>
>I know it sounds weird :-)
>
>I've looked into app_dial.c, but that code is doing way too much to easily
>understand what is necessary to do a call... and especially having two active
>destinations channel at a time is something that no other applications seems
>to do, not even MeetMe (MeetMe seems to do conferencing/voice stream mixing
>via a Zaptel device, doesn't it ?).
>
>Has anyone some suggestions for me ? Is it even possible without really nasty
>hacks to Asterisk itself ? Does anyone know of an application that does
>something remotely like the fdial I need to implement ?
>
>Thanks for your help in advance,
>	Marc Haisenko
>--
>Marc Haisenko
>Linux Solutions
>Be O.K. service group GmbH
>
>Rüdesheimer Straße 7
>D-80686 München
>Tel:   +49 (0)89 - 548 43 33 21
>Fax:   +49 (0)89 - 548 43 33 29
>e-mail: haisenko at be-ok.com
>http://www.be-ok.com


This sounds like you're trying to do an 
intercept, but with dual way audio?  I would 
suggest looking at app_chanspy for ideas.  I'm 
somewhat unclear on what the actual goal is of 
your project, so perhaps some diagrams might help 
here.

JT