How to limit incoming call on B-ACD CME?

Question

I have configure B-ACD on CME 4 and its working. But I have a problem with incoming call from outside (PSTN). I set queue-len for 30 queue. But on busy hour, some call hear only ring tone. No greeting tone or busy tone. When I check call session, its only 10 or 15 session.
How to limit incoming call, let say, for 10 calls only? The 11th call will receive busy tone.
Here are my config:
application
service queue flash:app-b-acd-2.1.2.2.tcl
param queue-len 30
param queue-manager-debugs 1
param number-of-hunt-grps 1
param aa-hunt2 0
service aa flash:app-b-acd-aa-2.1.2.2.tcl
paramspace english index 1
param number-of-hunt-grps 1
param handoff-string aa
param dial-by-extension-option 1
paramspace english language en
param max-time-vm-retry 1
param max-extension-length 7
param aa-pilot 2999
paramspace english location flash:
param second-greeting-time 30
param welcome-prompt _bacd_welcome.au
param call-retry-timer 15
param max-time-call-retry 60
param voice-mail 0
param service-name queue
FYI: I have no voice mail. 'param voice-mail 0' is to send unanswered call to my operator.
Regards,
Iwan

Answer 1

Hi Iwan,
To restrict the number of calls to the application you need to configure only the appropriate number (10 in your example) of dial-peers to point to the AA Pilot number. Have a look;
Set Up Incoming Dial Peers for AA Pilot Numbers
In this task, you associate dial peers for incoming calls with the AA service that you want them to use.
Cisco Unified CME B-ACD is available for outside calls through voice ports and trunks, for which dial peers must be set up. When you set up a dial peer, you use the service command to associate it with the name of the Cisco Unified CME B-ACD AA service that you want callers to that dial peer to reach.
Note You must configure a dial peer for each incoming DID voice port.
To determine how many ports or trunks you must have for your Cisco Unified CME B-ACD service, consider the following:
Total number of phones across all ephone hunt groups
Total number of slots in the queues across all queues
Total number of PSTN ports feeding into the queues
The number of simultaneous calls that Cisco Unified CME B-ACD can handle is limited by the number of PSTN ports, but these ports may not always be in use. For example, you could have three queues with ten slots per queue, but configure only 10 ports instead of 30 because you do not expect the three queues to ever be full at one time.
From this good doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps4625/products_configuration_guide_chapter09186a00805f2305.html#wp1003323
Hope this helps!
Rob