Is there a way to limit the volume of calls to a specific number on an incoming SIP trunk

[sevans]

I will start with our current situation, then explain the problem.  We have are using Cisco Unified Call Manager version 10.0.1.10000-24.  All incoming calls to our organization are received via SIP trunk.  We have recently purchased an existing clinic and added them to our network and phone system.  We have now ported their incoming phone lines from analog lines to our existing SIP.  Everything is working as we would expect.

Here is the problem.  This clinic had 7 incoming rollover lines.  Anything over 7 concurrent calls and the customers would get a busy line.  Now that we have moved to SIP, no more busy lines (which should be a good thing), all calls hit the phone system.  The problem is, we are overwhelming the secretaries with phone calls that could not get through before.  Is there a way, in call manager, to limit these incoming calls, based on the number called, and busy out any calls over that max number?  Any suggestions would be appreciated.

[Jaime Valencia]

Yes, maximum number of calls and busy trigger.

[Slavik Bialik]

As Jaime stated, you can use the "Busy Trigger" option under the line settings. Just set it to 1, so the phones will be able to get only one call.

I would also add those lines to a Hunt Group and enable the queuing option and put some queuing music, so if the 8th call comes in, it won't be disconnected, but it'll enter the hunt group's queue and will stay there until one of the secretaries will finish their call.