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Cannot sign in to Communicator because sign-in address not found

All user can login into to OCS but only 1 user can't login. Take all possible action but didn't work. It's may be SID related issues with OCS DB. How can I find which cause problem? I check on user system Event can't find any info? Where I can't find event log related this issue? In OCS server I can't anything either. Error message attached. All other user is ok. User has been created after & before this even all user are ok. But only 1 user having this problem...
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Hamid Reza Molahadi
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Other user can logon in same computer but that specific user can't logon and It's same with other computer as well. It's something to do with his SIP account may be.
aha, did you check the OCS administration console and communication tab in active directory user properties?
Maybe you would want to check on the setting in Office Communicator client by
Tools > Options ... > advanced.  and see if your server settings are correct?  (if manually set).

Also, you can also check on the OC Server > User > user's profile > 
-make sure the "Enable user for Office Communication Server" is check
-Other Settings > configure > Federation :  the 3 options are checked (if connection is through externally)?
   - Enable Federation
   - Enable Remote User Access
   - Enable public IM Connectivity
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This user settings it nothing different then other user. All are same. I found simillar problem on following:

https://www.experts-exchange.com/questions/23478915/How-do-I-troubleshoot-a-single-user-unable-to-sign-into-OCS.html?sfQueryTermInfo=1+10+30+address+becaus+cannot+commun+doe+exist+sign

Please mention the sysntex clearly for this command. I might try to check wither it's will fix the issue or not. Moreover I can't sure whether this problem will solve the issue or not as I check on OCS server event log under Application section but can't find the Event log. As a result can't sure what causing wrong. Please tell me where I can find the even log for this issue.
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I found the log file but there is too much information. Is there any particular info I need to look for to identify the problem? Or what are the to identify what causing the issue...
Error Event ID 30014

Where is your user in active directory? I mean is there special OU or something related to this user?
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I found the event ID# 4005 in log file in local system. Can't find any event ID on OCD or AD server for this reason.
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How to can I reset SIP attribute in AD to resolve the conflict.
Please copy the log here
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Via: SIP/2.0/TLS (pc IP)1.1.1.2:4160;ms-received-port=4160;ms-received-cid=175D00

ms-diagnostics: 4005;reason="Destination URI either not enabled for SIP or does not exist";source="OCS.domain.name"

Content-Length: 0
To verify that users were enabled

1) Log on to a server with the Office Communications Server 2007 R2 administrative tools as a member of the RTCUniversalUserAdmins group or with equivalent user rights.
2) Click Start, point to All Programs, point to Administrative Tools, and then click Office Communications Server 2007 R2.
3) Expand the forest node and the pool node, and then click Users.
4) Confirm that the users you successfully enabled for Office Communications Server are listed.
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ASKER

User is enabled but still the same error we get. As we discuss earlier somehow SIP attributed is not communicating with OCS. SIP attributed has been reset from AD but still the same issue.
Delete the use from active directory and create it again then enable it for SIP
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That's the things I want to avoid to delete user from AD as It's will create other problem for SID.I am looking for any other way around without delete the user.
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Thanks.