Call manager ipt phone displayed not enough bandwidth

[auraycats]

my shop has an intermittent problem, user presses message, cannot connect to Unity and ipt phone displys not enough bandwidth. I reset the phone/ext the voice mail connection/greeting comes back. who knows the possible root cause and resolution?

[Chris Deren · Accepted solution]

The message indicates that there is not enough bandwidth between the phone's Location and the voicemail port Location. It's a CallManager setting, make sure that your configuration is accurate to represent the proper Call Admission Control (CAC).

HTH,

Chris

[auraycats]

chris, what is the best throughput/guidance in the configuration for CAC?

[Chris Deren]

The available bandwidth between the branch site and the HQ.

So, if the link is for example Frame Relay with 512 kbps CIR, and you decide to dedicate 50 % of it to voice, using g.729 codec that gives you 256/28~ 9 calls.

CallManager assumes 24 kbps for g.729 call, so the remote branch location should be set to 9 * 24 = 216, and the VM ports should not be assigned to any location (assuming Unity is at HQ site).

You can also implemenent AAR to re-route the calls via PSTN (if feasible) when the bandwidth is exhausted.

Take a look at CCM SRND doc for more details:

wwww.cisco.com/go/srnd

HTH, please rate all posts!

Chris

[auraycats]

the problem has been resolved. the cause was Call manager voice port location was (none). The system confused to find the right location after we added new location for voip failed over. I created a new location for call manager voice port to Unity.