Business VoIP and phone systems

SIP trunks, Yeastar P-Series phone systems and managed business voice built on secure, resilient connectivity.

Migrate at the right pace

Retain a compatible PBX, modernise the system, or move the complete voice platform in one controlled project.

Make every call path intentional

Numbers, routing, queues, handsets, apps and continuity are mapped before the cutover.

Secure the full service

Connectivity, firewall policy, permissions, monitoring and support underpin the voice design.

Choose the right migration path

Start with the voice outcome, then select the system.

Each option solves a different level of change. The comparison makes the upgrade path clear without forcing a full replacement where it is not needed.

Retain

SIP Trunk Essentials

Move legacy voice access to SIP while keeping a compatible PBX and handsets.

BT Wholesale SIP service
Number porting and capacity planning
Call-divert and continuity options
Firewall and quality-of-service review

Explore SIP trunks

Recommended upgrade02

Modernise

Yeastar P-Series

Replace the phone system and give office and remote teams a consistent communications experience.

Linkus web, desktop and mobile clients
IVR, queues, routing and recording
Presence, contacts and conferencing
Optional contact-centre and CRM features

Explore P-Series

Unify

Managed Business Voice

Combine the SIP service, P-Series PBX, connectivity, security and support under one accountable partner.

End-to-end design and migration
Resilient connectivity options
Managed configuration and monitoring
One UK service and escalation route

Plan a managed system

Feature comparison

What changes at each level?

Capabilities shown are a planning guide. PBX compatibility, Yeastar edition and licensed feature plan are confirmed during solution design.

Requirement	SIP Trunk Essentials	Yeastar P-Series	Managed Business Voice
Retain a compatible PBX	Yes	Replaced by P-Series	Optional migration route
BT Wholesale SIP service	Included	Can be paired	Included in the design
Linkus web, desktop and mobile apps	Not included	Available	Available
IVR, queues and call recording	Existing PBX dependent	Available	Configured to requirement
Contact-centre reporting and integrations	Existing PBX dependent	Optional feature plan	Optional feature plan
Managed connectivity, security and resilience	Optional	Optional	Core to the solution
Best fit	Low-change line migration	Phone-system modernisation	Multi-site or business-critical voice

Security underpins every call

Voice is only as dependable as the network beneath it.

Liberty-i reviews segmentation, firewall policy, remote access, permissions, encryption support, monitoring and continuity alongside the call platform.

Separate voice and user network policy
Controlled administration and role permissions
TLS and SRTP support where compatible
Resilient access and tested continuity routes

Voice designed as part of the network

Liberty-i brings together the SIP service, PBX, connectivity, routing and security policy so call quality and business continuity are designed in from the start.

BT Wholesale SIPexpress and SIP trunking
Yeastar P-Series PBX systems
Number porting and migration planning
UK configuration, monitoring and support

Start with what you need to keep

Retain a compatible PBX and move the lines, modernise the phone system, or combine both as a fully managed voice platform. We map the route around users, sites, call flows and recovery requirements.

Built around your business

Ready for connectivity and voice you can trust?

Talk to a UK specialist about your sites, users, call flows and resilience requirements.

Start a conversation