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Enterprise Voice & Cloud Phone System

An operated cloud phone system instead of voice chaos: Anexum plans cloud telephony, SIP trunking, Microsoft Teams telephony, number porting, and the migration of existing PBX environments independently of any single carrier, with one owner for migration, operation, and escalation.

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Migration

From legacy PBX to an operated numbering plan

Cutover planSIP / Teams / PBX
T-21InventoryPlanned
T-14Migration planPlanned
T-07Teams Voice & UCPlanned
T-00Operation & escalationOperate
01

Inventory

Sites, number ranges, contracts, and dependencies documented before migration

02

Migration plan

Porting, SIP trunks, and transition windows planned without blind spots

03

Teams Voice & UC

Microsoft Teams, existing PBX systems, and carrier paths connected cleanly

04

Operation & escalation

Number management, provider coordination, and ongoing changes handled from one desk

What becomes controllable

Enterprise Voice is not a headset topic. It is operational reliability for reachability.

01

One numbering plan

Numbers, sites, teams, and users are documented instead of scattered across carrier portals and spreadsheets.

02

Carrier-independent migration

SIP trunk, cloud telephony, Microsoft Teams Voice, or existing PBX: the architecture follows operations, not a provider’s preferred product.

03

Porting with ownership

Anexum coordinates carriers, porting windows, and fallback paths so nobody has to search for the responsible party during cutover.

04

Teams Voice without another island

Teams becomes part of the numbering plan, site logic, and existing voice setup - not a loose collaboration add-on.

05

Operation after go-live

New users, removed numbers, site changes, and carrier questions do not remain stuck with the internal IT team.

06

One contact for voice and access

Because Anexum also operates connectivity, voice quality, circuits, and carrier escalation do not split into three separate responsibilities.

What is Enterprise Voice?
Enterprise Voice is operated business voice communication on IP technology: SIP trunking, Microsoft Teams Voice, number porting, number management, and unified communications in one controlled architecture.
How does number porting and number management work?
Anexum maps existing numbers to sites, teams, and users, plans the port with the involved carriers, and keeps the numbering plan current after go-live.
How does migrating from ISDN to VoIP and SIP trunking work?
The migration starts with inventory and risk analysis. Target architecture, carrier path, transition phase, and fallback options are defined before porting and go-live.
What does a cloud phone system cost?
Cost depends on the number of users, sites, number ranges, and required features. A per-user monthly price plus a one-time setup for porting and configuration is typical. Anexum calculates carrier-independently and picks SIP trunk, cloud telephony, or Teams telephony on need, not on provider commission.
Cloud phone system or virtual PBX: what is the difference?
Both terms usually mean the same thing: a phone system operated as a service from a data centre instead of hardware on site. The operation matters more than the label. What counts is who manages numbers, porting, Teams integration, and escalation. That is what Anexum handles.
How do I set up Microsoft Teams telephony?
Microsoft Teams telephony needs a voice channel in Teams, usually via Direct Routing with a SIP trunk or via Operator Connect. Anexum integrates Teams into the existing numbering plan, sets up Direct Routing, and connects existing PBX systems so Teams does not sit as an island next to the old telephony.

Services in this area

ISDN Migration to VoIP

Move to IP telephony provider-independently, with zero downtime

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Ready to bring your numbering plan under control?

Discuss voice migration