Coice class h323 => "call preserve" was added to 12.4(4)XT, which will also be available in 12.4(9)T this summer. This
works in conjunction with the "Allow Peer to Preserve H.323 calls" service parameter added into CCM 4.1(3)sr2 (es35) and above.
Prior to Call preserve, limited preservation was provided with "no h225 timeout keepalive" in IOS. That parameter had some holes in it...particularly in scenarios involving calls where only one side loses
connectivity to CallManager, and the other side receives a disconnect message. For example, a central IP Phone connected through a remote gateway, if the remote gateway loses connectivity to CallManager, the central phone may still receive a call clearing. Apart than no h225 timeout keepalive is not fully supported.
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...