[asterisk-dev] PJSIP_AOR and PJSIP_CONTACT Dialplan Functions

[Joshua Colp]

George Joseph wrote:

<snip>

>
> Why not...
> ${PJSIP_CONTACT(sip:alice at 10.24.19.55:5060
> <http://sip:alice@10.24.19.55:5060>)} => useful information! Including
> useragent. *AND ACTIVE CHANNEL IF ANY.*
>
> Skip the rest if you only need to know if in use.

It has pros and cons. It's easy and useful from a user perspective. From 
an implementation perspective it introduces a point at session 
setup/teardown where an exclusive lock has to be taken on a global 
container (remember, contacts may or may not be in memory and are 
immutable). It also means that if a scenario arises where the same 
Contact exists across different AORs then all channels will show up on 
all of them (even if different endpoint/AOR). This may be right, this 
may be wrong. It depends. It also means we would have to make the rules 
for matching of the Contact between the one on the AOR and the one in 
the session.

-- 
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org