[OpenSIPS-Users] 'canonical' domain / user ID

[Stefan Sayer]

Hello,

in a typical OpenSIPS 1.6.* home proxy type of setup (i.e. where you 
have opensips as registrar and home proxy) with aliases and 
multi-domain support, e.g. the one from the default opensips.cfg, is 
there a way to determine the 'canonical' domain and user ID, which is 
properly the same for a user in all cases, e.g. when sending to voicemail?

I know there's e.g. $rd, but if my proxy listens on sip.mydomain.and 
mydomain.net, then that may be either of them, or it may be the IP 
address.

The only proper solution that comes to my mind is to set a user 
preference (which would be like the primary key as afterthought...well 
we know the history). But I guess that this is a recurring issue for 
many things (aaa etc), so there should be a better solution i suppose.

Thanks!
Stefan