[Asterisk-Dev] IAX proxy/redirect support

[Michael Giagnocavo]

The closest is called a transfer. One end decides they want to step out of
the conversation, and connect two endpoints. So the transfer-requester
contacts the new endpoint and thus has 2 IAX calls established.

Then, the requester sends a TXREQ to each of the calls, giving a random
transfer ID + the address and callno of the other peer. Then each peer
contacts the other with a TXCNT, expecting a TXACC reply. After a TXACC is
received, the peers send a TXREADY to requester. When the request has both
TXREADYs, it transmits a TXREL[ease]. 

At this point, the requester only expects an ACK back, and then
communications cease with the requester and it has successfully transferred
out. The peers send a full voice frame to each other and the call continues
on its merry way.

Now.... the issues that rise are ones of billing and control. Since the two
phones have transferred out of you and are only talking between each other,
you have no control or information about the rest of the call. 

If you don't need control, then transfers are great. If you want correct
CDRs and so on... then it's a problem. What I suggest building is an
out-of-band signaling system for your gateways to keep accurate CDRs.

-Michael

-----Original Message-----
From: asterisk-dev-bounces at lists.digium.com
[mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of David Pollak
Sent: Friday, April 08, 2005 9:43 AM
To: Asterisk Developers Mailing List
Subject: [Asterisk-Dev] IAX proxy/redirect support

Howdy,

I'm designing a large Asterisk farm for a consumer voice service.  I'm 
using SER as a front-end for SIP traffic such that a client registers 
with sip.myservice.com and SER figures out which server actually handles 
the user's account and redirects (a 302 redirect like in HTTP) the SIP 
request to that server.  I've been trying to figure out how to do the 
same with IAX clients (I prefer IAX for a bunch of reasons and would 
like to promote their use.)  I've reviewed the IAX source to look for a 
"redirect" response with no luck.

Anyway, this may be a user question (although I've googled, read a 
number of user postings, and reviewed the source code and haven't found 
an answer.)

Is there a way to redirect an IAX registration and other IAX traffic a 
la SIP?  If not, does anyone else see a need for adding a redirect to IAX?

Thanks,

David


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