Call Function

• Call Hold
• Call Waiting
• Call Forward/ Transfer
• Caller ID
• 3-way conference
• Redial
• On demand call recording
• Do not Disturb (DND)

Network Protocol

• SIP v1,v2 (RFC2543/RFC3261)
• SIP RPORT(RFC3581)
• IP/TCP/UDP/RTP/RTCP
• IP/ICMP/ARP/RARP/SNTP
• TFTP/ FTP /DHCP/ PPPoE
• Telnet /HTTP/DHCP Server
• On demand call recording
• DNS Client