Fax lines must use: uLaw, 120s ring time, no voicemail. Voice lines can use: any codec, 120s ring time (if not using voicemail) with failover to alternate lines utilizing Busy and Offline destinations.
Keeping your extension numbers organized is the key to scalability. Extension numbers can be between 3 and 5 numbers. Here are some numbering guidelines to follow when building a new phone system. Extensions (Users) Pattern: 1 series Example: 101 IVR ...