Telephone
Modern voice, on the network you already have.
VoIP PBX, SIP trunks, DECT roaming and IP door-entry. We move you off ageing ISDN onto a flexible system that pairs with your data network and your KNX for free.
Discipline
Telephone
● Available now
What's included
Everything in one quote.
Below is the full scope of what we deliver under the telephone banner. Most clients pick a subset — we'll talk through which parts make sense for your building and budget on the first visit.
Cloud / on-prem PBX
3CX, Yealink, AVM FRITZ! and Auerswald — we install whichever fits your shape best, and run the dial-plan with you.
SIP trunking
Move off ISDN to SIP trunks with number porting. Lower per-minute rates, more flexible routing, future-proof.
DECT roaming
Site-wide cordless coverage with hand-over, multi-cell base stations and rugged handsets for hospitality and industrial.
IP door-entry
Behnke and 2N door panels that ring your desk phone, your mobile and your wall panel — all at once.
Our process
From walk-through to handover.
Audit
Existing extensions, lines and feature usage — plus how your team actually uses them.
Design
Dial-plan, hunt groups and porting schedule. Hardware list mapped to budget.
Install
PBX commissioned, handsets provisioned, trunks tested. Number port scheduled at the right time.
Train
On-site walk-through with your team, plus printed quick-start cards on every desk.
Case study
Family-run dental practice migration
Three-site practice was paying for ten ISDN channels they only needed at peak. We ported numbers to SIP, cut their line rental by 62%, and added DECT handsets so dentists answer back-of-house calls without leaving the chair.
Lower line rental
Downtime
Linked PBX
Why clients choose us
The benefits
Common questions
You asked, we answered.
Don't see your question? Drop us a line — a real engineer will reply within one working day.
ISDN is still being switched off, right?
Yes — most German operators are completing the IP migration. Switching now is cheaper than a forced migration later.
Can I keep my existing numbers?
Yes. Number porting is part of every move and we schedule it for off-hours so you have no downtime.
What happens to the door-entry intercom?
IP door panels integrate with the PBX and ring multiple devices simultaneously. The old analogue intercom is replaced as part of the same project.
Cloud or on-prem PBX?
Most clients save money on cloud. On-prem makes sense if you have very large call volumes or sensitive data. We quote both.
Let's Talk
Time to retire the old phone system?
No-pressure site visits. Itemised quotes. Honest timelines.