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Which CUCM /SCCP/firmware load versions are supported by NAT?

April 26, 2017cucm firmware load NAT sccp supported versions

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Which CUCM /SCCP/firmware load versions are supported by NAT?

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A. NAT supports CUCM version 6.x and earlier releases. These CUCM versions are released with the default 8.3.x (or earlier) phone firmware load that support SCCP v15 (or earlier). NAT does not support CUCM versions 7.x or later releases. These CUCM version are released with the default 8.4.x phone firmware load that supports SCCP v17 (or later). If CUCM 7.x or later is used, an older firmware load must be installed on the CUCM TFTP server so that the phones use a firmware load with SCCP v15 or earlier in order to be supported by NAT. The link below confirms that firmware load 8.3.x contains SCCP v15 or earlier and will work with NAT and that firmware load 8.4.x contains SCCP v17 and will NOT work with NAT. http://third-gen-phones.gforge.cisco.com/twiki/prod/bin/view/Thirdgenphones/CCMLoadNumberAndCodeNameDecoderRing Refer to NAT-Support of IP Phone to Cisco CallManager for more information about NAT and SCCP.