Technical Details:\n• Models: GXP1620 / GXP1625\n• Phone Type: SIP IP desk phones\n• Lines: Support up to 4 SIP accounts\n• Display: Backlit LCD (basic status/info screen)\n• Network: 2 × Ethernet ports (10/100 Mbps)\n• Audio: HD voice (wideband codec support) for clear conversations\n• Speakerphone: Full-duplex hands-free speakerphone\n• PoE:\n– GXP1620: Requires external power adapter\n– GXP1625: Supports PoE (802.3af) and optional adapter\n• Power: 5V/1A power adapter (included/optional)\n• Security: SIP over TLS, SRTP, HTTPS, 802.1x, VLAN support\n• Phone Features: Call hold, transfer, forward, mute, conferencing, voicemail access\n• Use Cases: Office desks, call agents, small business phone systems