Grandstream GRP2603P 3-Line Gigabit IP Phone with PoE

The Grandstream GRP2603P is a 3-line desk IP phone with 6 SIP accounts, dual Gigabit ports, PoE and a 2.7-inch backlit screen. It is aimed at secretaries, supervisors and front-desk staff in offices running a Gigabit network.

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The Grandstream GRP2603P is the three-line model in the GRP2600 Essential range: 6 SIP accounts, dual Gigabit Ethernet, PoE and a 2.7-inch backlit graphical screen. It is aimed at people who watch more than one number at a time, such as secretaries, team supervisors and front-desk staff in a clinic or small office, and it keeps full network speed for the PC plugged in behind it.

Grandstream GRP2603P specifications

• 3 line keys with dual-color LEDs, 6 SIP accounts.
• Up to 3 call appearances.
• Dual Gigabit 10/100/1000 Mbps ports.
• Integrated 802.3af Class 1 PoE (3.84 W).
• 2.7-inch backlit graphical LCD, 132×64.
• 26 languages including Arabic.

Three lines, color-coded

Each line key has a two-color LED, so a glance tells you whether a line is busy or ringing. With 6 SIP accounts you can map one key to your own extension, one to the department number and a third to a line shared with a colleague through SCA/BLA. A dedicated HOLD key, one of nine fixed keys, lets you park one caller and pick up another without opening a menu.

Gigabit for the PC behind the phone

On 10/100 phones the PC that connects through the handset is capped at 100 Mbps. The GRP2603P has Gigabit on both ports, so the PC gets full network speed, which matters for anyone moving large files or working in an ERP system all day. Power comes from a PoE switch and there is no adapter in the box; to run it without PoE, add the Grandstream 5V/0.6A PSU.

Audio and desk comfort

The handset and speaker deliver HD wideband audio, and the full-duplex speakerphone lets both sides talk at once without clipping. Noise Shield and AI noise reduction keep office noise down. The stand offers two angles, 39° and 45°, and the faceplate can be swapped to carry a company logo. An RJ9 jack takes EHS-compatible Plantronics, Jabra or Sennheiser headsets.

Security and provisioning

Secure boot, dual firmware images and encrypted storage, plus TLS 1.3, DTLS-SRTP and SDES-SRTP media encryption and 802.1X. Bulk provisioning runs through GDMS, TR-069 or AES-encrypted XML.

Where it fits

• Secretaries and department managers.
• Reception at small clinics and real estate offices.
• Shift supervisors in warehouses and factories.
• Management offices in small hotels.

Compatibility

Works with Grandstream UCM systems, Yeastar PBXs and any SIP PBX, and wall-mounts with the GRP-WM-A bracket. Hot-desking and server failover are supported too.

GRP2603P vs GRP2602P

The GRP2602P has 2 lines, 4 SIP accounts, 10/100 ports and a 2.41-inch screen, enough for someone handling a single number. The GRP2603P adds a third line, two more accounts, Gigabit ports and a larger 2.7-inch display, the better pick on a Gigabit network or for staff covering several numbers.

Frequently Asked Questions

Does the GRP2603P include a power adapter?

No. The P model runs on PoE and ships without one. Without a PoE switch, add the Grandstream 5V/0.6A PSU.

Are the network ports Gigabit?

Yes. Both ports are 10/100/1000 Mbps, so the PC passes through at Gigabit speed.

How many calls can it handle at once?

Up to 3 call appearances on 3 line keys, with 6 SIP accounts.

Specifications

• Model: GRP2603P
• Series: GRP2600 Essential
• Lines / SIP accounts: 3 lines, 6 SIP accounts, up to 3 call appearances
• Line keys: 3 line keys with dual-color LEDs
• Display: 132×64 (2.7") backlit graphical LCD
• Softkeys: 4 context-sensitive XML-programmable softkeys
• Navigation keys: 5 navigation/menu keys
• Fixed keys: 9: MESSAGE (with LED), TRANSFER, HOLD, HEADSET, MUTE, SEND/REDIAL, SPEAKERPHONE, VOLUME +/-
• Auxiliary port: 1 × RJ9 headset jack, EHS compatible (Plantronics, Jabra, Sennheiser and more)
• Network: Dual switched auto-sensing 10/100/1000 Mbps ports, integrated PoE
• PoE: IEEE 802.3af Class 1 (3.84 W), 802.3az (EEE) supported
• Wi-Fi / Bluetooth: No
• Audio: HD handset and full-duplex HD speakerphone, wideband audio
• Protocols: SIP RFC3261, TCP/IP/UDP, RTP/RTCP, RTCP-XR, HTTP/HTTPS, ARP, ICMP, DNS (A, SRV, NAPTR), DHCP, PPPoE, SSH, TFTP, NTP, STUN, SIMPLE, LLDP-MED, LDAP, TR-069, SNMP, 802.1X, TLS, SRTP, IPv6
• Voice codecs: G.729A/B, G.711 μ/a, G.726, G.722 (wideband), G.723.1, iLBC, Opus
• DTMF: In-band and out-of-band (RFC2833, SIP INFO)
• Audio processing: VAD, AEC, CNG, PLC, AGC, AJB, plus Noise Shield and AI noise reduction
• Telephony features: Hold, transfer, forward, 5-way conference, call park, call pickup, shared/bridged line appearance (SCA/BLA), call waiting, auto answer, off-hook auto dial, click-to-dial, flexible dial plan, hot-desking, custom ringtones and music on hold, server redundancy and failover
• Phonebook / call log: Downloadable phonebook (XML, LDAP) up to 2,000 entries; call log up to 800 records
• QoS: Layer 2 (802.1Q, 802.1p) and Layer 3 (ToS, DiffServ, MPLS)
• Security: TLS 1.3, HTTPS with SHA-256 passwords, SIP over TLS with mutual certificate validation, DTLS-SRTP and SDES-SRTP media encryption, 802.1X, secure boot, dual firmware images, encrypted data storage
• Languages: 26 languages including Arabic and English
• Upgrade / provisioning: Firmware via FTP/TFTP/TFTPS/HTTP/HTTPS; mass provisioning via GDMS/TR-069 or AES-encrypted XML
• Faceplate: Swappable faceplate for logo customization
• Stand / wall mount: 2 stand angles (39° and 45°); wall-mountable (GRP-WM-A bracket sold separately)
• Power: PoE, or 5 V / 600 mA adapter (not included)
• Operating temperature: 0 to 40°C
• Storage temperature: -10 to 60°C
• Humidity: 10–90% non-condensing
• Dimensions: 214 × 206 × 68 mm with handset
• Weight: 780 g (1,140 g packed)
• In the box: Phone, handset with cord, stand, network cable, quick installation guide (no power adapter)
• Compliance: FCC Part 15 Class B and Part 68 HAC, CE, RCM, IC

Features

• 3 LED line keys, 6 SIP accounts: up to 3 call appearances, with line status shown by color.
• Dual Gigabit 10/100/1000 Mbps ports: the PC gets full network speed through the phone.
• 802.3af Class 1 PoE (3.84 W): one cable for data and power; no adapter in the box.
• 2.7-inch backlit graphical LCD (132×64): clear caller ID and Arabic menus.
• Dedicated HOLD key among 9 fixed keys, plus a full-duplex HD speakerphone: hold and transfer with one press.