[SR-Users] Kamailio + Asterisk, what happens when limit for gateway is reached

[Sasa Vilic]

Hello,

I have read here about load balancing between multiple gateways by using 
carrierroute module, but there is one particular question for which I 
found no answer.

Let's say I have two asterisk servers (X und Y), that are my gateways to 
PSTN. Let we do it simple. Let's say that each gateway supports only one 
outgoing call at the time and there is no incoming calls from PSTN. Now:

Bob calls one number and Kamailio uses X gateway.
Alice calls other number and Kamailio uses Y gateway.
Alice terminates the call.
Alice place a new call, but Bob's call is still in progress.
If we were used round robin algorithm, Kamailio would then use X 
gateway, but X gateway is currently occupied. What shell happen now?
And what if Alice didn't tear down call ordinary? What if it her SIP 
client simply crashed? (Then kamailio would think that there is now free 
gateway)

So the main question is: can kamailio know/detect, how much calls are 
going over one particular gateway and what can be done when limit for 
this gateway is reached?

Thank you in advance.

Kind Regards,
Sasa Vilic
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