... Termination Single or Dual Stage Dialing Service Authentication via PIN, Digest, Caller ID (Bellcore Type 1) Per Call Authentication ... Enable/Disable VoIP Caller Auth Method (None, PIN, HTTP Digest) VoIP PIN Max Retry Setting One Stage Dialing Enable/ ... Protected Admin and User Access Authority Provisioning/Configuration/Authentication: HTTP Digest - Encrypted Authentication via MD5 (RFC 1321) Up to ...