The exclamation mark shows up when a PPM/AST download has failed on the IP Phone. IP Phones in the AST mode (registered to Session Manager, with an off PBX station on Communication Manager) receive CM features and buttons via SIP subscribe and notify messages. When a subscribe/notify fails and the IP Phone displays the exclamation mark on the phone screen.
This was tested in a Communication Manager and Session Manager environment in an Avaya services lab.
Two common reasons for this issue are -
- Origination and Termination Application Sequences are not configured in the Session Manager Profile section of the User Profile administration in System Manager.
- The Communication Manager is missing an entry (Ext length, Ext Code, SIP Trunk Group and Total Length) in the private/public-unknown numbering form. This is generally the case when a specific series of extension have the problem.
