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sip to sip config losing "content-length" on second leg

Hi, I am doing some testing and have a wierd problem.

I am using a 1760 running 12.4(19) as a sip to sip gateway from CCM 5.x or 6.x to Microsoft OCS. All works fine when I enable MTP on the trunk, but I need this configuration to workout the MTP coming from CCM and I have the following problem.

The INVITE (without SDP) from CCM -> the Gateway contains everything including a "content-length:0" , however, in the next leg of the call, it goes missing. The INVITE FROM the gateway to OCS is missing the content-length header value and the OCS mediation server promptly rejects the connections as it does not contain "content-length"

Something must be causing this to be stripped out (Maybe because it had a length of 0).

Anyone know if this is a known bug ? Anyone thing of a way around it ?

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Re: sip to sip config losing "content-length" on second leg

Enable the persistence rebalance feature on the server.

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