Description
Tired of missing visitors at the door because you're on a call or away from your desk? The Viking C-250 lets any single-line phone or phone system share the same line with a Viking door entry phone, so you never have to choose between your current call and whoever is ringing at the door.
When a visitor presses the entry phone button, the C-250 rings your inside phones with a distinctive double-burst pattern so you know right away it's a door call — not a regular one. If you're already on a call, a gentle call-waiting tone alerts you without interrupting your conversation. Answer, talk to the visitor, and unlock the door with a simple touch-tone code. If no one inside picks up, the built-in 5-number dialer automatically cycles through up to five outside numbers until someone answers. It works with all Viking E-Series and K-Series analog entry phones and connects easily in series to a single phone line or PBX trunk port — no complex rewiring needed.
From small offices and apartment buildings to warehouses and residential homes, the C-250 is a straightforward, proven solution for reliable door communication and access control without adding a second phone line.
Our Expert Take: The C-250 hits a sweet spot for anyone who wants real call-forwarding and door strike control without investing in a full VoIP or IP-based access system. The trigger input for a Request-to-Exit (REX) button or postal lock is a detail that installers genuinely appreciate — it covers edge cases that simpler controllers miss entirely. If your environment is analog and you need something that just works day after day, the C-250 is hard to beat. Keep in mind its operating temperature tops out at 90°F, so if your equipment closet runs hot, plan for adequate ventilation.
Key Features
- Shares one phone line between your regular phones and a single Viking entry phone — no second line required
- Built-in 5-number dialer with busy/no-answer detection — automatically tries the next number in sequence
- Double-burst ring pattern distinguishes door calls from regular incoming calls
- Built-in SPDT door strike relay activated by 1- or 2-digit touch-tone commands
- Call-waiting tone alerts you to a door call while you're already on a call
- Trigger input supports postal lock, Request-to-Exit (REX), or instant call forwarding
- Remote programming from any touch-tone phone
- Auto answer with fast touch-tone detection as quick as 50 ms
- Compatible with all Viking E-Series and K-Series analog entry phones or any standard analog phone
- Made in the USA with 12 cage clamp screw terminals for clean, reliable connections
Technical Specifications
- Power: 120VAC / 13.8VAC 1.25A UL listed adapter (included)
- Dimensions: 5.25″ x 4.1″ x 1.75″ (133mm x 104mm x 44mm)
- Shipping Weight: 2 lbs (0.9 kg)
- Operating Temperature: 32°F to 90°F (0°C to 32°C)
- Humidity: 5% to 95% non-condensing
- Relay Contact Rating: SPDT, 5A @ 30VDC / 5A @ 250VAC
- Ring Output: 5 REN (can ring up to ten 0.5 REN phones)
- Talk Battery: 32VDC
- Connections: 12 cage clamp screw terminals
- Certifications: FCC Part 68, FCC Part 15