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Mari,Have you tried changin the destionation at the option 3 to a Cisco SIP Phone or SCCP? Is it failing just for this SIP Third Party?Is your CUC integrated with SIP or SCCP?
As you said at the second message."I want to use SIP message's attach data sending by GW to CUCM. But this attached data lost while passing through to the another sip server. This attached data contains data that depends on each GW's config.I'm tryin...