Telephony Features:
- Caller ID, Call Waiting, Call Forwarding
- Call Hold, Call Transfer (Attended/Blind)
- 3-Way Conferencing
- Speed Dial, Hotline, Do Not Disturb
- Message Waiting Indicator (MWI)
- Busy Tone Detection
- Polarity Reversal
- Flexible Dial Plan and Number Manipulation
Security and Networking:
- Built-in firewall and IP access control
- TLS and SRTP encryption
- Static IP, DHCP, PPPoE
- VLAN support (802.1Q)
- NAT traversal, STUN
- OpenVPN client




