asterisk users - Sep 2003 - Limiting the number of SIP/IAX "lines"

Is it possible to limit the number of "lines" provided by a given
SIP/IAX
connection? For example: I want to limit SIP extensions to only a single 
incoming line, even the phone itself can handle three. Or, I might want to 
prevent extensions from making more than one outgoing call at a time. Or, I 
might want to protect my bandwidth/call quality by limiting outgoing calls 
through NuFone to only three calls at a time.

Any thoughts?

Thanks,
--Ernest

>Is it possible to limit the number of "lines" provided by a given 
>SIP/IAX connection? For example: I want to limit SIP extensions to 
>only a single incoming line, even the phone itself can handle three. 
>Or, I might want to prevent extensions from making more than one 
>outgoing call at a time. Or, I might want to protect my 
>bandwidth/call quality by limiting outgoing calls through NuFone to 
>only three calls at a time.
>
>Any thoughts?
>
>Thanks,
>--Ernest
There is a patch already in the bugtracker for outgoing SIP: 
http://bugs.digium.com/bug_view_page.php?bug_id=0000098

I imagine that it would be a good idea to also implement the same 
thing for IAX.  Submit a feature request (and hopefully a patch, 
too!) via the bugtracker, and maybe it will get implemented.  :)

You can already handle this, sort of, by using incrementing variables 
stored in the local database (DBPut, DBGet) or by using an AGI script 
to keep a counter on each outgoing peer.  That's not a particularly 
clean way of doing it, but it certainly would work.

JT