Up ro16 SIP accounts

Call hold, mute, DND

One-touch speed dial, hotline

Call forward, call waiting, call transfer

Redial, call return, auto answer, direct IP call

5way conferencing

Group listening, SMS, emergency call

Ring tone selection/provisioning

Set date time automatically or manually

Dial plan per account

RTCP-XR (RFC3611), VQ-RTCPXR (RFC6035