[Asterisk-Users] Dynamically limiting the number of outbound calls

[Marty Mastera]

> In our setup, outbound call volume frequently exceeds the 
> line capacity of the DSL line. We do not want to move to 
> another codec to better utilize the line, but instead wish to 
> automatically divert overflow to the Long Distance T1 when 
> the DSL is "full". Ideally the system would also be able to 
> adjust automatically to network conditions such as network 
> outage, high latency, jitter and/or packet loss. If the LD T1 
> was also full or if there was no other path, Dial would 
> return busy/congestion instead of connecting a call of low quality.
> 
> I realize that one solution is to manage variables using 
> macros in the dialplan and keep a count of VOIP calls. I 
> believe that this a) difficult to maintain b) can be 
> difficult to dynamically adjust based on parameters from the 
> jitter buffer, round trip time, and/or packet loss c) 
> couldn't be "the best way to do it".
> 
> Before I go slinging code, does anyone know of a clean 
> solution? Do other people need / desire this functionality?
> 
> Our Setup:
> 	Software: Suse 9.2 + Asterisk 1.0.7 (built from CVS)
> 	Network: DSL measured to be 2 mbps up / 430 kbps down
> 	Termination: IAX2 / G711 / nufone and voipjet
> 	Zaptel: 2 digium 100 cards one connected to a Siemens 
> PBX and the other to a (long distance) provider,signaling is E&M Wink
> 


Jim:

I am doing something very similar using SetGroup and CheckGroup.  Take a
look at those commands on the wiki, and especially to the n + 101
priority to accomplish a failover in the case that your "trunk limit" is
reached.

Marty