I have just upgrade a voice gateway running on a Cisco 2911 router with the latest IOS and have now had the NM-HDV2 board disabled due to incompatible IOS. I know these modules have been EOL for some time though I needed to upgrade to enable SIP Session Refresh. Now looking at the Cisco documents it only ever mentions the minimum supported IOS 12.something, there is no mention of the last supported IOS. I am going to take another punt and select an IOS that was released around the same time as the module went EOL. If anyone knows of an IOS that supports both NM-HDV2 and the command Voice Service "Voip > SIP > Session Refresh" it would be appreciated. I currently have 15.7(3).M5 installed.
