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Fast busy when using IPC to start an ad-hoc conference call

Unanswered Question
Dec 18th, 2009
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CUCM 7.1(3) and IPC

When I call from my IPC client to another IPC user and try to initiate an ad hoc conference call I get wave off (fast busy). This also happens when I call our MeetingPlace Express bridge number. I'm guessing this is a codec issue since the bridges use G.711 and IPC is using iLBC. If this is the case would IPC just renegotiate the codec? Or am I missing something else? The bridges work fine when called from an on-net desk phone.

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Overall Rating: 5 (1 ratings)
Michael Murray Fri, 12/18/2009 - 08:58
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Figured it out:


"Note: When you use Optimize for low bandwidth, it is difficult to connect to some applications that use a different codec other than G.729. For example, Cisco Conference Connection can only use G.711 codec, thus Cisco IP Communicator is unable to dial a MeetMe Conference number."

I also didn't have any G.729 audio ports configured on MeetingPlace Expess. They were all G.711. System Configuration > Meeting Configuration > G.729 ports (cost per port: 5 SRUs)

Rob Huffman Fri, 12/18/2009 - 14:00
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Hi Michael,

Thanks for posting up your solution here

Very kind my friend! (+5)




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