Product Type VoIP phone Body Color Silver, dark gray Body Material ABS plastic Key Expansion Module Max Qty 2 Dialer Type Keypad Dialer Location Base Conference Call Capability Yes Intercom N/A Speakerphone Yes Caller ID Yes Automatic Redial Yes Voice Mail Capability Yes Call Waiting Yes Call Forwarding Yes Call Transfer Yes Call Hold Yes Menu Operation Yes Function Buttons Conference button, speakerphone button, headset button , mute button, hold button, voice mail button Programmable Buttons Qty N/A Volume Control Yes Ringer Control Yes Indicators Voice message waiting indicator, speakerphone indicator, headset, mute Firmware Upgradable Yes Additional Functions Call timer, built-in clock, pager call Additional Features On-hook dialing, music on hold, built-in web server Main Features Multiline support, multiple VoIP protocol support, integrated GigE Ethernet switch, EHS and Power over Ethernet (PoE) support, TR-69/104/111 VoIP Protocols SIP, SIP v2, SPCP Voice Codecs G.722, G.729a, G.711u, G.711a, G.726 Lines Supported 1 Line Quality of Service IEEE 802.1Q (VLAN), Differentiated Services (DiffServ), IEEE 802.1p, Type of Service (ToS) IP Address Assignment DHCP, static Security SIP/TLS, SRTP, HTTPS Network Protocols IP, TCP, TFTP, UDP, ICMP, ARP, HTTP, DNS, HTTPS, SRTP, CDP, LLDP-MED Network Ports Qty 2 x Ethernet 10Base-T/100Base-TX/1000Base-T Voice Features Comfort noise generation (CNG