Description
The AT&T SynJ SB67108 is a 4-line cordless accessory handset for SynJ small-business phone systems. Teams use it to add another walking phone to an existing SB67118, SB67138, or SB67158 base so staff can answer any of the four lines away from the desk. DECT 6.0 digital technology and push-to-talk intercom are the two specs that matter most at purchase. This is not a standalone phone. It must be registered to a compatible SynJ base before it will place or receive calls.
The Telecom Spot Take
Buy the SB67108 when you already have a SynJ 4-line base and need another handset for a shop floor, warehouse aisle, private office, or anyone who cannot stay tied to a corded set. Register it at the base, park it on the included charger, and it shares the same four lines, intercom, and call transfer the rest of the system uses. Do not buy it as a first phone. Without a SynJ base it will not work.
Key Features
- 1- to 4-line operation: All four SynJ lines show on the handset, so a person walking the floor can pick up the same calls as the front desk.
- DECT 6.0 zero blind spot digital technology: The handset talks to the base on the 1.9 GHz DECT band, which is built to stay clear of common Wi-Fi and 2.4 GHz interference in an office.
- Push-to-talk intercom: Staff can page from base to handset or from handset to handset without placing an outside call. Handy when you need someone in another room right now.
- System expansion up to 10 cordless handsets: Add SB67108 units through a single phone jack as the team grows. Each new handset must be registered to the base before use.
- Intercom and call transfer: Move a live call between handsets and the base instead of asking the caller to hang up and dial again.
- Handset speakerphone and 2.5 mm headset jack: Take the call hands-free on the speaker, or plug in a 2.5 mm headset when you need both hands on a keyboard or a part.
- 100-name/number phonebook plus 10 speed-dial and 10 intercom locations: Keep frequent vendors, extensions, and inside contacts on the handset so people are not hunting a paper list.
- 3-party conferencing: Bring a third person onto the call from the handset when a quick three-way conversation will close the issue.
- Caller ID and 50-name/number call history: Name and number show on the handset when your phone company provides Caller ID/Call Waiting. History stores the last 50 records so missed calls are easy to return.
- Line status and message-waiting indication: See which lines are busy and when a message is waiting, then retrieve messages from the handset.
- Blue backlit keypad and display, plus volume and ringer controls: Use the phone in a dim stockroom. Set handset, speakerphone, headset, and ringer volume separately, and pick a ringer tone that fits the room.
- Everyday call tools: Mute, hold, chain dialing, and last-10-number redial cover the short tasks people actually do all day.
Technical Specifications
| Specification | Details |
|---|---|
| Model | SynJ SB67108 |
| Product type | DECT 6.0 4-line cordless accessory / expansion handset |
| Brand | AT&T (SynJ) |
| SKU / MPN | SB67108; ATT-SB67108; ATTSB67108; manufacturer SKU 01878 |
| UPC / GTIN | 650530018787 |
| Color | Black/Silver |
| Compatible bases | AT&T SynJ SB67118, SB67138, and SB67158 (handset must be registered to the base) |
| Lines | 1 to 4 |
| System expansion | Up to 10 cordless handsets on a SynJ system, through a single phone jack |
| Wireless technology | DECT 6.0 zero blind spot digital |
| RF frequency band | 1921.536–1928.448 MHz (1.9 GHz) |
| Channels | 5 |
| Intercom | Push-to-talk, base-to-handset and handset-to-handset |
| Call transfer | Between handsets and base |
| Conferencing | 3-party |
| Speakerphone | Yes (handset) |
| Headset jack | 2.5 mm |
| Phonebook | 100 names/numbers |
| Speed dial | 10 locations |
| Intercom number locations | 10 |
| Redial | Last 10 numbers |
| Caller ID / Call Waiting | Yes; requires a subscription from the local telephone company |
| Caller ID history | 50 names/numbers; displays on the handset |
| Display / keypad | Blue backlit keypad and display |
| Other call features | Mute, hold, chain dialing, selectable ringer tones, volume control (handset, speakerphone, headset, ringer), line status, message-waiting indication, message retrieval from handset |
| Setup menus | English/Spanish (US); English/French (Canada) |
| Talk time | Up to 5 hours (earpiece or speakerphone); actual time varies with use and battery age |
| Standby time | Up to 4 days; actual time varies with use and battery age |
| Battery | 3.6 V 600 mAh Ni-MH; replacement part 27910 |
| Handset voltage | 3.2–4.2 VDC |
| Charger input | 96–127 Vrms, 60 Hz |
| Charger output | 9 VDC @ 200 mA |
| Operating temperature | 32°F–122°F (0°C–50°C) |
| Product size / weight | 3" × 4" × 9" (W × D × H); 1 lb |
| Gift box | 5.11" × 8.85" × 2.36"; 1.32 lb |
| Country of origin | China |
| Warranty | 2-year limited warranty (manufacturer spec sheet) |
| Package contents | Cordless handset; battery pack (27910); battery compartment cover; charger with power adapter installed; belt clip; user’s manual; quick start guide |
Frequently Asked Questions
Will the SB67108 work by itself?
No. The SB67108 is an expansion handset only. It has to be registered to a compatible AT&T SynJ base (SB67118, SB67138, or SB67158) before it can place or receive calls. If you do not already have that base, start with the base, then add handsets.
How many SB67108 handsets can one SynJ system use?
The manufacturer rates the SynJ system for up to 10 cordless handsets on a single phone jack. New handsets are numbered in the order you register them. Register each unit at the base before you put it into service.
What is in the box?
The package includes the cordless handset, Ni-MH battery pack (part 27910), battery compartment cover, charger with the power adapter already installed, belt clip, user’s manual, and quick start guide. A SynJ base is sold separately.
Does Caller ID work out of the box?
Caller ID and Call Waiting on the handset need a subscription from your local telephone company. When that service is active, the handset can show name and number and keep a 50-entry call history.
How is the handset powered?
It is not a PoE device. Charge it on the included AC charger (9 VDC @ 200 mA). Manufacturer talk time is up to five hours. Standby is up to four days. Replacement battery is part 27910 (3.6 V 600 mAh Ni-MH).


