1. Dial by local extension (*)
2. Dial by callsign. No need to lookup extension in Whitepages or maintain a list of IP addresses.
3. Dial other N2MH trunked phones around the world.
4. Dial in/out via POTS phone patch.
5. Utilities
• Touch Tone test
• Date and time
• Conference room
• Echo test
• Milliwatt (set local volume level)
• 3-tone slope
• Switch identifier
• Extension identifier

(*) If/when W8BI and W8GO PBXs were active, their extensions could be dialed by their 4 digit extensions.