4 - Add register status information
12 - User definable Voicemail answer delay and on/off.
21 - Dial plan fail over. i.e if dialling an entry fails, look for the next matching priority (if one exists) and try that one.
16 - Call forwarding via dial plan, i.e. ability to set up a call forward to any number (including PSTN)
3 - Call history feature
If #12 can be extended to include user definable times (e.g. after hours) for calls to go straight to voicemail that would be perfect!
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