| Technical Specifications – Grandstream GRP2650 |
| Model | GRP2650 |
| Device Type | Carrier‑Grade IP Medium Phone |
| SIP Accounts / Lines | 12 SIP accounts |
| Display | 3.5″ Color (480×320) LCD |
| Programmable Keys | 12 SIP function keys |
| Navigation Keys | Navigation D‑pad, soft keys, function keys |
| Audio | HD Audio with full‑duplex speakerphone |
| Headset Support | RJ9 wired; EHS support (Plantronics, Jabra, Sennheiser) |
| Ethernet | Dual 10/100 Mbps LAN and PC ports |
| PoE Support | Yes (GRP2650P, IEEE 802.3af) |
| Wi‑Fi Support | Yes (GRP2650W, 2.4 GHz) |
| Audio Conferencing | 5‑way voice conferencing |
| Voice Codecs | G.711μ/a, G.722, G.726, G.729AB, G.723.1, iLBC, OPUS |
| Telephony Features | Hold, transfer, forward, call park/pickup, BLF, speed dial, call waiting |
| Security | Secure boot, dual firmware images, encrypted configuration, TLS, SRTP, 802.1x |
| Protocols Supported | SIP RFC3261, TCP/IP, UDP, RTP/RTCP, HTTP/HTTPS, DNS, DHCP, STUN, LLDP‑MED, SNMP, TR‑069, IPv6 |
| Provisioning & Management | GDMS cloud zero‑touch provisioning and centralized management |
| Power | 100–240 VAC → 5 VDC or PoE (GRP2650P) |
| Dimensions (W×D×H) | 216 × 214 × 62 mm |
| Weight | Approx. 900 g |
