Technical Details:\n• Model: GXP2135\n• Phone Type: SIP-based IP desk phone\n• Display: Large 4.3″ color LCD with backlight\n• Lines: Up to 12 SIP accounts\n• Network: 2 × Gigabit Ethernet (10/100/1000) ports\n• Audio: HD audio with wideband support\n• Bluetooth: Built-in Bluetooth for wireless headsets and audio\n• PoE: Yes (802.3af/at) and external PSU support\n• Keys: Programmable LED line/feature keys and navigation buttons\n• Speakerphone: Full-duplex hands-free speakerphone\n• Security: SRTP, TLS, HTTPS, IPv6 support\n• Phone Features: Call hold, transfer, forward, conferencing, voicemail, XML apps, LDAP\n• Power: PoE or 5V/2A power adapter\n• Use Cases: Office desks, contact center agents, professional environments.