[Users] Routing

[Klaus Darilion]

Douglas Garstang wrote:
> We have a configuration where OpenSER sit's between Polycom phones
> and Asterisk. Off-net/PSTN calls are also sent from Asterisk to
> OpenSER to be routed to a Mediacodes Gateway.
> 
> I'm having a hell of a time with the routing in general! What is the
> best way to route calls? Should I be looking at the URI? The From:?
> The To:? The method?

Routing should be done on the request URI. In my setup, routing for all 
mehtods is identical, except some special cases (e.g. voicemail failure 
route only for INVITE, special handling for CANCEL and ACK, special 
handling for OPTIONS and SIPURA's keep alive NOTIFY requests ...)

> Also, the convention seems to be that the URI contains where the
> message is going TO rather than where it came FROM. However, routing
> is much easier if the URI has where it came from.

I use is_from_gw() (lcr module) to detect calls from the gateways. All 
other requests are handled to come from local users or are incoming SIP 
calls.

> For example, messages from the phones have a URI of: uac.voip.com
> 
> and messages from Asterisk have the IP adress in the URI, as Asterisk
> doesn't seem to let you set the URI. Calls from the Mediacodes have a
> URI of: pstn.voip.com
> 
> Is adding sub-domains like 'uac' and 'pstn' a good way to route? I've
> looked at all the examples I could find but unfortunately they're
> ridiculously simple.

If I receive a request from the gateway, I do use opnly the user part of 
the request URI (the called phone number) for routing.

In my setup Asterisk is only used for voicemail, echotest ... Thus 
asterisk never initiates calls, thus I do not have to care about calls 
from asterisk. If you use it also as gateway, do it like above - just 
take a look at the userpart. Use a common format for all gateways.

Maybe you are mixing authentication and routing. Do not authenticate 
gateways according their domain in the URIs. Check src_ip to 
authetnicate trusted nodes (gateway, media server) and use the request 
URI to route.

regards
klaus


> Every time I look at openser.cfg I get VERY STRESSED OUT!
> 
> Thanks.
> 
> 
> 
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