Callmanager 7.0 not sending ACK

Unanswered Question
Aug 10th, 2009
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Hi all,

I'm having the folowing problem with sip calls:

When i try to call from cisco callmanager to a GSM sip gateway the callmanager never send the ack to a status 200:ok messague that is send from the gateway to the callmanager and since i dont have early-media configure the the sdp is never send from the callmanager to the gateway. The flow for the messages is the folowing :

CM to GSM-Gateway









Since the ack to the status 200 OK is never send the call is never stablishes

Does any one have an ideia


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wole.bamidele Mon, 08/10/2009 - 03:32
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Hello all.

Pls i need your help, I have a UC520 device and my IP phones 521SG and 524SG Phones are not communicatiing with it. My IOS is 12.4 and CME version is 3.0.

Kindly help.

patcbr600 Mon, 08/10/2009 - 03:39
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Are the phones register with the CME ?,


wole.bamidele Mon, 08/10/2009 - 06:26
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Pls explain wat u mean?

Also wats the diffrence between Cisco Unity Express and Communication manager Express.

Nicholas Matthews Mon, 08/10/2009 - 04:15
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You need to be on 12.4(20)T or 12.4(11)XW7 or higher for the CP-500 phones to register.


wole.bamidele Mon, 08/10/2009 - 06:31
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Thanks Nick,

I use 12.4(11)XW7 and its not registering.

My phones are 524SG,521SG and SPA525G.

I use cisco unity express 3.0.

Nicholas Matthews Mon, 08/10/2009 - 15:29
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I think it may be XW8. Trying to find original release, but cannot find the IOS required for these.



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