Grandstream GXP2135 8-Line IP Phone with 32 BLF Keys and Gigabit

The Grandstream GXP2135 is a multi-line GXP2100 phone with 8 line keys, 4 SIP accounts and 32 virtual BLF keys on a 2.8-inch color display. It is designed for staff who field many calls and pass them on, such as sales desks and customer service teams.

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The Grandstream GXP2135 is built for the person whose phone never stops ringing. It pairs 8 line keys running on 4 SIP accounts with 32 virtual BLF keys on a 2.8-inch color display, so one desk can watch a whole department and route calls without guesswork. Dual Gigabit ports, PoE and built-in Bluetooth make it a fit for sales desks, customer service teams and executive assistants in mid-sized companies.

Grandstream GXP2135 key specifications

• 8 dual-color line keys and 4 SIP accounts.
• Up to 32 programmable BLF/speed-dial keys.
• 2.8-inch TFT color display, 320x240.
• Two 10/100/1000 Mbps Ethernet ports with integrated 802.3af PoE.
• Built-in Bluetooth and an RJ9 headset jack with EHS support.
• 4-way audio conferencing and a 500-entry call log.

Why 8 lines on 4 accounts?

Accounts are the numbers or registrations on your PBX. Line keys are how many calls you can see and handle at once. When the sales number rings while you are already talking, the second call lands on its own key: hold the first, answer the second, then switch back. That is exactly what a front-line agent needs all day.

32 BLF keys to watch the whole team

The screen shows virtual BLF keys that tell you which extensions are free and which are busy. A customer service supervisor in a Dammam branch sees the entire team and hands the next call to whoever is available, without asking around. The same keys can be speed dials or used to pick up a call ringing at a colleague's desk.

Paired with a Grandstream UCM

The GXP2135 supports ZeroConfig provisioning with UCM systems: plug it in and it pulls its settings from the PBX. It also offers one-touch call recording, handy for sales teams that need to check order details later. With other platforms it works over standard SIP (RFC3261) and can be provisioned via TR-069 or an encrypted XML file.

Typical uses in Saudi Arabia

• Customer service desks and small call centers in Riyadh and Jeddah.
• Reservations offices at hotels and serviced apartments.
• Executive secretaries handling calls for several managers.
• Sales offices at showrooms and car dealerships.

Audio and headsets

Both handset and speaker deliver HD audio, and the full-duplex speakerphone keeps words from cutting out when both people talk. For long shifts, pair a Bluetooth headset or use a wired Plantronics headset with EHS. The stand offers two angle positions, and the phone can go on a wall with a mount sold separately.

GXP2135 or GXP2160?

The GXP2160 has a larger 4.3-inch 480x272 screen, 6 SIP accounts, 24 physical BLF keys, a USB port and 5-way conferencing. The GXP2135 gives you 8 line keys and 32 on-screen BLF keys in a smaller body. Choose the GXP2135 when call and extension count matter most, and the GXP2160 when you want a clearer screen and more accounts.

Frequently Asked Questions

How many SIP accounts does the GXP2135 support?

4 SIP accounts spread over 8 line keys, so several calls can appear on the same account at once.

Are the 32 BLF keys physical buttons?

The official datasheet describes them as programmable virtual BLF keys shown on the screen, not separate buttons.

Does the GXP2135 work with the GXP2200EXT module?

No. The official GXP2200EXT datasheet lists the GXP2140 and GXP2170 as compatible phones, not the GXP2135.

Specifications

• Model: GXP2135
• Series: GXP2100 Enterprise IP Phones
• Lines / SIP accounts: 8 dual-color line keys, 4 SIP accounts
• BLF keys: Up to 32 digitally programmable BLF/fast-dial keys (virtual, on screen)
• Keys: 4 XML-programmable context-sensitive soft keys, 5 navigation keys, 11 dedicated function keys: MESSAGE (with LED indicator), PHONEBOOK, TRANSFER, CONFERENCE, HOLD, HEADSET, MUTE, SEND/REDIAL, SPEAKERPHONE, VOL+, VOL-
• Display: 2.8-inch 320x240 TFT color LCD
• Protocols / standards: SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP, ICMP, DNS (A record, SRV, NAPTR), DHCP, PPPoE, SSH, TELNET, TFTP, NTP, STUN, SIMPLE, LLDP, LDAP, TR-069, 802.1x, TLS, SRTP, IPv6, CDP/SNMP/RTCP-XR
• Network interface: Dual switched auto-sensing 10/100/1000 Mbps Gigabit Ethernet ports, integrated PoE
• Voice codecs: G.729A/B, G.711µ/a-law, G.726, G.722 (wide-band), G.723.1, iLBC, Opus
• DTMF / audio processing: In-band and out-of-band DTMF (in-audio, RFC2833, SIP INFO); VAD, CNG, AEC, PLC, AJB, AGC
• HD audio: Yes, HD handset and speaker with wideband audio, full-duplex speakerphone
• QoS: Layer 2 (802.1Q, 802.1p), Layer 3 (ToS, DiffServ, MPLS)
• Security: User and administrator level passwords, MD5 and MD5-sess authentication, AES-encrypted configuration file, SRTP, TLS, 802.1x media access control
• Languages: English, German, Italian, French, Spanish, Portuguese, Russian, Croatian, Chinese (Simplified and Traditional), Korean, Japanese and more (Arabic listed in the official GXP21xx user guide)
• Upgrade / provisioning: Firmware upgrade via TFTP / HTTP / HTTPS, mass provisioning via TR-069 or AES-encrypted XML configuration file, FTP/FTPS
• Bluetooth: Integrated
• Auxiliary ports: RJ9 headset jack (EHS with Plantronics headsets)
• Telephony features: Hold, transfer, forward, 4-way conference, call park, call pickup, SCA/BLA, downloadable phonebook (XML, LDAP, up to 2000 items), call waiting, call log (up to 500 records), screen customization, off-hook auto dial, auto answer, click-to-dial, flexible dial plan, hot desking, personalized ringtones and music on hold, server redundancy and fail-over
• With Grandstream UCM: ZeroConfig provisioning and one-touch call recording
• PoE: Integrated PoE, 802.3af
• Power adapter: Input 100-240 V, output +12 V 0.5 A
• Power consumption: 6.4 W (power adapter), 6.49 W (PoE)
• Stand / mounting: Base stand with 2 angle positions; wall mountable (wall mount sold separately)
• Temperature / humidity: Operating 0 to 40°C, storage -10 to 60°C, 10% to 90% RH non-condensing
• Dimensions: 201 mm (W) x 193 mm (L) x 85 mm (H)
• Weight: 0.85 kg
• Compliance: FCC Part 15 (CFR 47) Class B; CE: EN55022 Class B, EN55024 Class B, EN61000-3-2, EN61000-3-3, EN60950-1; RCM: AS/ACIF S004, AS/NZS CISPR22/24, AS/NZS 60950.1
• In the box: GXP2135 phone, handset with cord, base stand, universal power supply, network cable, Quick Installation Guide, GPL license

Features

• 8 line keys on 4 SIP accounts: take several calls on the same number and jump between them with one key each.
• 32 on-screen BLF/speed-dial keys: monitor 32 extensions from a single desk.
• One-touch call recording and ZeroConfig provisioning when paired with a Grandstream UCM PBX.
• Dual 10/100/1000 Mbps ports with integrated PoE: one cable for phone, PC and power.
• Built-in Bluetooth and EHS for Plantronics headsets: wireless or wired headset for long call shifts.