1. The common PSTN phone.
2. The VoIP phone, supports SIP (RFC3261) protocol.
3. Standard SIP call forwarding.
4. Call transfer from VoIP to PSTN
5. Call transfer from PSTN to VoIP
6. Audio Codec supports: G. 729, G. 711, G. 723, GSM
7. Supports AEC
8. Automatic detect/re-generate local PSTN busy-tone and DTMF
9. Both PSTN and VoIP caller ID detection
10. PSTN cable connect state detection
11. Supports connecting Internet devices: LAN/ADSL/broadband router
12. NAT traversal
13. Supports time/DNS/DHCP server
14. Upgrade firmware via web browser
15. Customize ring.
16. Configuration by web browser or keypad.
17. 4 groups of stored settings.
18. 80 entries of call log for missed calls, answered calls and dialed calls