Telephone Systems from Mitel
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Telefonanlagen – Technical Background & Applications
Phone systems – also called PBX (Private Branch Exchange) – are the central communication system of every business. Modern IP phone systems use the SIP protocol (RFC 3261) and support unified communications, video calls, voicemail-to-email and mobile clients. Agfeo and Auerswald are the leading German manufacturers with broad SIP endpoint compatibility; Innovaphone and Unify offer enterprise solutions with high scalability. Hybrid systems combine ISDN extensions with SIP trunking, enabling step-by-step All-IP migration without replacing all equipment. Cloud PBX solutions are suitable for distributed sites and home office scenarios without capital investment in hardware.
Our range covers systems for 2 to over 1,000 users – on-premise, hybrid or cloud. Matching IP system phones, DECT system phones and headsets are immediately available. Advice on system selection, licence planning and SIP trunk integration: +49 (0)7666 / 88499-0, sales@industry-electronics.com.
Application Areas
| ✓ Business Telephony & Call Centres | ✓ Authorities & Public Institutions |
| ✓ Industrial Environments & Production Halls | ✓ Hotels & Hospitality |
| ✓ Hospitals & Care Facilities | ✓ Data Centres & IT Infrastructure |
Frequently Asked Questions
▶ What is the difference between analogue, ISDN and IP phone systems? Analogue systems transmit voice as electrical signals over copper. ISDN systems use digital S0/S2M interfaces with standardised protocols (EuroISDN, Q.931). IP PBX systems digitise voice with codecs like G.711 or G.722 and transmit over Ethernet via SIP. Modern hybrid systems support all three simultaneously. |
▶ What is a SIP trunk and how does it differ from an ISDN line? A SIP trunk is a virtual phone connection over the internet that replaces ISDN lines. It uses the SIP protocol (RFC 3261) and allows any number of simultaneous calls without physical line limits. SIP trunks are more cost-effective than ISDN and scale flexibly. A SIP-capable PBX and stable internet connection are prerequisites. |
▶ How many extensions does a small phone system support? Entry-level systems like Agfeo ES 512 IT or Auerswald COMpact 5020 VoIP typically support 4–32 internal extensions with 2–8 simultaneous calls. Mid-range systems scale to 100–300 extensions. Enterprise platforms from Innovaphone or Unify OpenScape Business support thousands of users. |
Why industry-electronics.de?
▶ Professional TK Range Over 15,000 telecoms products from Agfeo, Auerswald, Snom, Yealink, Innovaphone, Gigaset and other leading manufacturers. | ▶ B2B Expert Advice Our TK team advises on SIP migration, DECT planning, emergency call systems and standards compliance – free and vendor-neutral. | ▶ Volume Pricing from 1 Unit Quantity discounts, project prices and framework agreements for system integrators, authorities and industrial companies. |
▶ Fast Delivery Most items available from stock – free shipping across Germany from minimum order value. | ▶ 20+ Years TK Experience For over 20 years, Industry-Electronics has supplied system houses, authorities and industrial customers with professional telecoms technology. | ▶ Standards-Compliant Range All products comply with applicable EN, ETSI and VDE standards and regulatory approvals for commercial use. |