CIPC Drops Calls on Connect

Unanswered Question
Jun 22nd, 2009

User has IP Communicator over AnyConnect VPN. Calls between extensions work fine, seems to work if user places call to outside, but when a call comes in when the user attempts to answer, the call is dropped.

He thinks it happens mostly with internatinal calls but it did happen when I tried calling on my cell phone.

I have this problem too.
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gogasca Mon, 06/22/2009 - 09:09

Have u tried disabling G729 ?

Open CIPC, Right Click, Preferences, Optimize for Low BW.

Thanks - I've been searching for 3 days for a resolution and found the codec on the CIPC to be the issue.

CUCM 4.2

ASA 8.0.4

AnyConnect VPN 2.2

CIPC 7.0.2

Internal users could make 3 or more way conferences with no issue, both on-net (IP to IP phone/softphone) and external through GW (PSTN).

Remote users on AnyConnect VPN coming through ASA FW could set up 2 - way call but when trying to conference in a 3rd party, the initiating caller would receive fast busy tone and drop out of the conference.

MY CUCM is set to G.711 internal and G.729 across my WAN (we use intercluster trunks to global CUCM clusters).

Once I changed the CIPC preferences to un-check "optimise for low bandwidth" I could establish multiple way calls from the CIPC devices.

Now I need to understand the impact of changing the CUCM to force a standard G. codec across internal (on-net & trunk) and external (CIPC).

Any suggestions?

benharned Tue, 07/28/2009 - 20:50

I somehow missed this reply. I unchecked the "optimize..." option and calls are now being connected both ways!

I'll have to notify the end user about this and monitor what affect this has on call quality.

benharned Wed, 07/29/2009 - 05:02

Thanks for the info. That doesn't seem a severe trade-off. Who really has low BW anymore anyway? Unreliable, I can see, but those times I think are intermittant.

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