I plan to migrate a CUCM Cluster 4 to 7, the customer have 10 remote sites which have 2801 GW IOS 12.4 registred with H323 protocol.
I want to know please if i must migrate IOS of GWs before the migration of the CUCM cluser ? my question is about the compatibily of SRST in the IOS 12.4 with the CUCM 7.
SRST 4.3 and later
Table 60 Cisco Unified Survivable Remote Site Telephony Compatibility with Cisco Unified Communications Manager Release 3.x through Release 8.x
To find your IOS version support check here (CME version = SRST version)
Cisco Unified CME and Cisco IOS Software Version Compatibility Matrix
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