[OpenSER-Users] SRV records

[Iñaki Baz Castillo]

El Tuesday 16 October 2007 17:29:06 Antonio Reale escribió:
> Ok, thanks.

Note that in a DNS SRV query the client gets all the entries (as in any other 
DNS query) so it his responsability to query the second alternative 
(priority&weight) if the first doesn't response.
But there is ystem DNS cache and so...


> So what happen if a call starts on the first proxy, OpenSER on the first
> proxy goes down and one of the clients close the call?
> If the client sends the BYE on the second OpenSER, the proxy is able to
> associate it with the correct call (for example for accounting purpose)?

Remember: OpenSer is not dialog aware (except using "dialog" module, but it's 
not the purpose).
OpenSer is just transactions aware. In a simple dialog there are at least 
those transactions:

- INVITE (from caller to called) and responses 100, 180, 200.
- ACK (from caller to called)
- BYT (from caller to called) and response 200.

All these 3 transactions becomes a dialog JUST in the endpoints (phones), but 
for OpenSer they are completely INDEPENDENT transactions.

I recomend you study it a lot since it's vital:
  http://www.switzernet.com/people/emin-gabrielyan/070410-SIP-transactions/
  http://4z.com/people/emin-gabrielyan/public/070412-SIP-record-route/




-- 
Iñaki Baz Castillo
ibc at in.ilimit.es