- HTTP(S) (SSL/TLS) protocol support
- RFC 6238 One Time Password Authentication
- Administrator Interface
- Enterprise (Virtual PBX) Interface
- End-User Interface (calls, voicemail, features)
- ITSP Interface for customer support
- Self-Signup Interface
Session Initiation Protocol (SIP 2.0)
Inter-Asterisk Exchange Protocol (IAX2)
SCCP Protocol *
H.323 Protocol (gateway only) †
Requires additional configuration and/or software
* might require additional hardware