I thought that no CCM 4.2 to 5.x upgrade path existed either, but have a look at this excerpt from the doc that Brandon sent;
The system-wide testing of IP telephony functionality for Cisco Unified Communications Release 5.1(1) included the following:
Testing on two distinct upgrade paths for North America IP telephony main components:
Multistage upgrade from IP Communications System Test Release 4.2 versions to Cisco Unified Communications Release 5.1(1) versions. For a list of the base Release 4.2 versions, see the Systems Release Notes for North America IPT: IP Communications Systems Test Release 4.2 at:
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...
If you have 2 ISR routers, one acting as Failover, do we need to have both the same number of SRST licenses on the 2 routers?
No. You will only need the SRST licenses on the primary router. Because this feature...
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