Shaun Ewing wrote:
You need to do an incremental upgrade - eg: SIP 2.3 -> SIP 4.4 -> SIP 7.3.
The ealier images can be obtained from Cisco if you have a valid CCO login.
Actually, you need to go from earlier version to version 5. This is the version Cisco started using an encrypted firmware. Once you've moved to 5, you cannot go back to an earlier version. I went from 2.x to 5 and then from 5 to 7.3. Keep in mind, you need to include both the P003-07-3-00 and P0S3-07-3-00 in the SIPDefault.cnf and OS79XX.txt
[OS79XX.txt]
P003-07-3-00 P0S3-07-3-00
[SIPDefault.cnf]
# SIP Default Generic Configuration File
# Image Version image_version: P003-07-3-00 image_version: P0S3-07-3-00
This worked for me on 3 phones so far.
Doug
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