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ITS AG

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Modern Business Telephony & Cloud PBX

ITS AG provides modern business telephony with VoIP, SIP trunks and virtual PBXs – flexible, location-independent and fit for modern business communication.

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Why classic PBXs are no longer fit for purpose

Classic PBXs (ISDN, analogue telephone systems) are inflexible, expensive to maintain and not built for modern work. Every new employee, every new site, every change becomes an overhead. Home-office and mobile staff are hard to integrate. Modern companies need telephony that adapts to their way of working – not the other way around. VoIP and virtual PBXs solve exactly that.

How modern business telephony works

ITS AG sets up a modern telephony solution for your company, based on VoIP technology and SIP trunks. Your calls flow over your internet connection instead of dedicated telephone lines. That saves cost, is flexible and integrates seamlessly with ITS AG business internet and site networking. Staff are reachable at their usual business number whether in the office, at home or on the road.

Features and capabilities

  • Virtual PBX – no hardware to host on site
  • SIP trunks for flexible, cost-effective call channels
  • Integration of office, home office and mobile staff
  • Number portability – keep your existing numbers
  • Queues, forwards and IVR menus
  • Scale without hardware cost – new users in minutes

Built for both perspectives

What a cloud phone system means for your operations

Two perspectives, one outcome: IT that carries reliably and stays transparent.

For management

  • Modern reachability – a professional external appearance
  • Predictable monthly cost instead of expensive PBX maintenance
  • Flexible user count – easily scales with growth
  • Professional image through unified corporate telephony

For IT leads

  • Central management of all extensions and numbers
  • Easy integration into existing networks and systems
  • Significantly less hardware overhead than classic PBXs
  • Good scalability during growth or organisational changes

Technical specifications

What you can expect from this service

Concrete numbers instead of marketing — traceable, contractually mappable, audit-ready.

Architecture

Cloud PBX in our DC

redundant across 2 sites

Endpoints

IP phones, soft client, mobile app

iOS/Android

Integrations

Microsoft Teams, Outlook, CRM

standard APIs

Emergency calls

Site-accurate routing

TKG-compliant

Fax / analog

ATA adapter supported

for legacy hardware

SLA

99.9 % availability

incl. failover to second DC

How we work

From first conversation to ongoing operation

A clearly structured process — no hidden phases, no surprise invoices.

  1. 01

    Telephony inventory

    Numbering plan, existing endpoints, special features (hotline, hold music, call groups) — all captured.

  2. 02

    Migration plan

    Written approach: which numbers port when, which endpoints to swap, which workflows to rebuild.

  3. 03

    Pilot with test number

    Selected staff use the new system in parallel — bugs are fixed before the real porting.

  4. 04

    Wave porting

    Site by site or department by department — with fallback if something does not fit.

  5. 05

    Ongoing operation

    Self-service portal for standard changes, dedicated contact for complex tasks, semi-annual optimization check.

Typical use cases

Where location-independent calling makes the biggest difference

Three constellations we see often — and how we deliver in them.

ISDN / PBX migration

Legacy PBX is end-of-life and unsupported. We migrate numbers, endpoints and workflows without service interruption.

Hotline / inbound service

Customer service with queues, skill-based routing and reporting — without separate call-center software.

Mobile + multi-site

Staff use the same number from branch, home office and mobile. One reachability, one voicemail.

Use cases

When moving to cloud telephony pays off most

Companies replacing their classic PBX

Businesses with home-office and mobile staff

Multi-site organisations wanting unified telephony

Growing companies needing flexible communication

Direct comparison

ITS AG vs. standard providers

How we are concretely different — laid out honestly.

Direct comparison
ITS AG
Standard provider
Teams/CRM integration
Standard APIs, one-time setup
Often per-user, per-month add-on licenses
Migration
Legacy stays available in parallel until cut-over
Big-bang at the cut-over date with risk
Self-service
Portal for standard changes, training included
Every change via paid hotline
Multi-site logic
Multiple sites under one PBX, one reporting
One PBX per site, separate reporting

Evidence from customer projects

What a cloud phone system changes day to day

Concrete numbers from real projects.

0 down minutes

on the porting of 250 numbers for a midsize tax advisory

180 staff

migrated to one cloud PBX — across HQ + 4 branches + home offices

42 sec

average pickup time on a service hotline after introducing skill routing

Frequently asked

What customers ask about Modern Business Telephony & Cloud PBX

  • A virtual PBX is a telephony solution that does not live as physical hardware inside the company but is delivered as a service from a data center. All functions of a classic PBX are available – forwards, queues, extensions – but without the hardware dependency.

Related services

Business internet & failoverSecure multi-site networking

Next step

Let's talk about Modern Business Telephony & Cloud PBX.

30 minutes are enough for an honest assessment of whether and how we can help. Free, no obligation, personal.

06021 49649-0

Reply usually within one business day.