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Does NAT support Skinny Client Control Protocol (SCCP) v17 which is shipped with Cisco Unified Communications Manager (CUCM) V7?

April 26, 2017cisco unified client CONTROL NAT Protocol sccp shipped skinny support v17

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Does NAT support Skinny Client Control Protocol (SCCP) v17 which is shipped with Cisco Unified Communications Manager (CUCM) V7?

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A. CUCM 7 and all of the default phone loads for CUCM 7 support SCCPv17. The SCCP version used is determined by the highest common version between CUCM and the phone when the phone registers. NAT does not yet support SCCP v17. Until NAT support for SCCP v17 is implemented, the firmware must be downgraded to version 8-3-5 or below so that SCCP v16 is negotiated. CUCM6 will not encounter the NAT problem with any phone load as long as it uses SCCP v16. Cisco IOS does not currently support SCCP version 17.