Grandstream GRP2601P PoE 2-Line 2-SIP Essential IP Phone with Adapter Model: Grandstream GRP2601P PoE 2-Line 2-SIP Essential IP Phone Lines: 2 lines SIP Accounts: 2 SIP accounts Display: 2.4-inch (132 × 48) LCD display Audio: HD audio with noise shield technology and echo cancellation Conferencing: 5-way audio conferencing Network Ports: Dual 10/100 Mbps Ethernet ports Power: Built-in PoE (IEEE 802.3af), no adapter required in PoE setups Adapter: External power adapter support (optional, depending on package) Headset Support: RJ9 headset port with EHS support (Plantronics, Jabra, Sennheiser) Codecs: G.711, G.722, G.723, G.726, G.729, iLBC, OPUS Protocols: SIP, TCP/IP, RTP/RTCP, HTTP/HTTPS, DHCP, DNS, TLS, SRTP Management: Grandstream Device Management System (GDMS) support Security: Secure boot, encrypted storage, TLS/SRTP encryption Features: Call hold, transfer, forward, call waiting, call log, click-to-dial, phonebook support Power Consumption: Low power via IEEE 802.3af PoE Mounting: Desktop or wall-mountable Application: Office telephony, call centers, enterprise VoIP communication