your in owa and you try to im within owa to a client and that works fine but the client tries to reply and gets a error 504 message

 

ensure you have applied the latest patches for OCS 2007 R2

and the following patch http://support.microsoft.com/?kbid=967674

now once you have done that locate the following 3 dll’s

Microsoft.rtc.collaboration.dll
Microsoft.rtc.internal.media.dll
Sipeps.dll

and ensure they have the sames versions and size as in the patch!

now once you got this done… locate and copy the dll’s to the c:\program files\microsoft\exchange server\v14\bin

dont forget to rename the old ones…

restart the World Wide Web Publishing Service and voila! all is working

hope it helps!

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