Built for today.
Inspired by timeless design.
Modern technology. Effortless integration. Personalised for your property.
Works with your existing systems.
Our telephones are compatible with the most common hotel infrastructures. No changes required to your setup.
Analogue
Traditional hotel phone lines.
VoIP
Internet-based systems used in modern properties.
VoLTE
SIM-based mobile connectivity – ideal where cabling is limited.
Check compatibility with your PBX
Tell us what you're using — we'll confirm our match.
Full SIP & protocol specifications
VoIP phones support SIP v1 (RFC 2543) and SIP v2 (RFC 3261).
Confirmed interop with: Mitel, Avaya, Cisco, NEC, Alcatel-Lucent, 3CX, Grandstream, Yeastar, BroadSoft, Asterisk.
VoLTE / SIM phones work on all European mobile networks. The SIM slot accepts standard mini-SIM (15 × 25 mm) on most models — please confirm at order time.
Analogue (POTS) models accept standard FXS line voltage and conform to ITU-T loop signalling.
Codec support (VoIP): G.711a / G.711µ / G.722 / G.729a / opus depending on model. Detailed datasheet available on request — see quote form.
Designed for an easy rollout.
From single boutique hotels to multi-property groups, every shipment arrives ready to install.
Pre-configured
We prepare and test every phone before delivery.
Plug-and-play installation
Quick to install with minimal technical effort.
Installation support
Remote or on-site support available when you need it.
Bulk deployment guidance
We help you plan and roll out across single or multiple properties.
Customisation options to match your brand and needs.
From custom faceplates with your logo to pre-programmed speed dials, colour finishes, and bespoke hardware modifications — we'll help you create a phone that's truly yours.
- Custom dial inserts & faceplates
Add your logo, brand or bespoke design. - Pre-programmed numbers
Front desk, room service, spa, emergency. - Custom colours and finishes
From classic tones to signature shades. - Additional buttons / functionality
Extra speed dials, service keys, custom features. - Hardware modifications
Tailored solutions for specific requirements.
Your German partner for vintage-inspired hospitality telephones.
Opis Technology GmbH is your German partner specialising in vintage-inspired telephones for modern hospitality.
German engineering, help and support teams.
Trusted by hotels and design-led properties worldwide.
A passion for classic design and modern technology.
Quality that lasts.
We use premium materials, rigorously test our devices, and offer spare parts and support.
Let's make it perfect for your property.
Our team is ready to advise you on the best solution for your hotel.