Alcatel add new extension

1. Ask ESI to configuration free extension range if there is no spare extension
2. use 4760i to update username and display name and phone model
3. use voicemail admin to create voice mail account ( setup password to 1xxx )
4. connect the user phone port to phone system by black cable
5. dial the extension by phone to login
6. login voice mail by 1xxx and configure empty greeting and reset voice mail password to 0xxx