Six SIP accounts, a 3.66-inch 240×120 backlit monochrome screen, 21 multi-page programmable keys, dual gigabit ethernet with PoE, a USB port for wired or wireless headset support, and EHS. The T27G is the T2 series' power-user phone — and one of the best feature-per-dollar Yealinks in the catalog.
The T27G is the phone we recommend when someone asks for 'a real business phone without paying for a touchscreen.' Six SIP accounts is more than enough for almost any deployment short of a call-center supervisor. The 21 programmable keys spread across multiple visual pages give you serious BLF capacity without a sidecar — three pages of seven keys is enough to monitor a 15-20 person team comfortably.
The defining feature that puts it ahead of the T23G is the USB port. You can plug in a wired USB headset (Jabra, Plantronics, Yealink's own UH36) for clean two-channel audio with the host PC, or use Yealink's EHS adapter for wireless headset call control. For any agent or admin who spends real hours on the phone, this is the difference between a phone you tolerate and a phone you actually like.
Honest weakness: the screen is still monochrome. In 2026 a $50-more T53 gives you the same six lines with a 3.7-inch color screen and a marginally newer chassis. The T27G stays in the catalog because the price-to-feature ratio is unbeatable for monochrome-tolerant deployments — back-office, dispatch, call-center floor — and the firmware is exceptionally stable. For an executive desk, get the T53. For a working desk, get the T27G.
| Display & user interface | |
| Display | 3.66-inch 240×120 pixel backlit graphical LCD |
| Programmable keys | 21 line keys across 3 visual pages, dual-color LEDs |
| Soft keys | 4 context-sensitive soft keys |
| Navigation | 5-way nav, dedicated hold / transfer / mute / message / headset / speaker keys |
| VoIP & SIP | |
| SIP accounts | Up to 6 SIP accounts |
| Protocols | SIP v2 (RFC 3261), TLS, SRTP, STUN, BLF/BLA, shared call appearance |
| Codecs | Opus, G.722, G.711(A/μ), G.723.1, G.729AB, G.726, iLBC |
| Provisioning | FTP/TFTP/HTTP/HTTPS, PnP, TR-069, Yealink RPS |
| Security | HTTPS, TLS, SRTP, 802.1X, AES-encrypted config |
| Audio | |
| HD voice | HD handset and HD speakerphone (G.722 wideband) |
| Speaker | Full-duplex hands-free with AEC |
| Headset | RJ9 + USB (wired headset), EHS for wireless |
| Connectivity | |
| Ethernet | Dual 10/100/1000 Mbps gigabit |
| PoE | IEEE 802.3af Class 2 |
| USB | 1 × USB 2.0 (headset, Wi-Fi dongle WF40/WF50) |
| Wi-Fi / Bluetooth | Via optional WF40 (Wi-Fi) or BT40 (Bluetooth) USB dongles |
| Power & physical | |
| Power | PoE 802.3af, or 5V/2A external adapter |
| Dimensions | Approximately 241 × 220 × 41 mm |
| Wall mount | Yes |
| In the box | |
| Included | T27G handset, base, curl cord, ethernet cable, stand, provisioning card |
| Not included | Power adapter (PoE preferred), USB headset, Wi-Fi/BT dongles |
Plug the T27G into PoE and ethernet. About a minute later it has registered to your extension. Same auto-provisioning flow as every other supported phone — no SIP credentials to type, no firmware to chase.
Boot, fetch config from our provisioning server, register, ready. About one minute on a normal connection.
6 lines per phone. Each line key has a dual-color LED for status at a glance.
21 multi-page · BLF-capable mapped from the voip.army portal — BLF, paging, parking, transfer destinations.
Bringing your own? Send us the MAC, factory-reset, plug in. No charge to add it to the fleet.
Standard PoE — any 802.3af-compliant switch from the last 15 years powers the phone without an adapter.
Tested against every Yealink firmware release for T27G. We catch regressions before they reach your fleet.
Tell us how many you need and what extensions to map. We ship pre-configured next business day; you plug them in and they work.