Inbound numbers
New UK numbers and DDI ranges subject to availability and service validation.
BUSINESS VOICE CONNECTIVITY
SIP trunks, numbers and routing under control.
Connect compatible phone platforms to UK business numbers and calling services with planned capacity, porting and resilience.
SIP TRUNK DESIGN
Capacity and number control for business calling.
The trunk should match the phone platform, call volumes, security policy and continuity requirement.
Number porting
Controlled migration of eligible existing numbers using accurate provider records.
Calling capacity
Plan concurrency around busy-hour traffic rather than user count alone.
Routing options
Direct inbound calls to the correct platform, site, queue or continuity route.
Fraud controls
Apply suitable authentication, restrictions, limits and international calling policy.
Failover planning
Agree alternate routing where the PBX, site or primary connectivity is unavailable.
NUMBER GOVERNANCE
Build a reliable number register.
Large number estates become risky when ownership, installation address and destination are unclear.
✓
Provider records
Collect invoices and losing-carrier details before submitting a port.
Collect invoices and losing-carrier details before submitting a port.
✓
Number ownership
Record department, user, purpose, criticality and current destination.
Record department, user, purpose, criticality and current destination.
✓
Emergency data
Maintain correct location information for the agreed voice service.
Maintain correct location information for the agreed voice service.
✓
Testing plan
Pilot routes and validate inbound and outbound calling before major moves.
Pilot routes and validate inbound and outbound calling before major moves.
UKDDI
Search and order available UK business numbers.
Use UKDDI for new geographic number searches. Porting existing numbers requires separate validation and acceptance.
Open UKDDIDELIVERY PROCESS
Controlled SIP and number migration.
Avoid treating a complex number estate as one administrative form.
Inventory
Record every number, range, address, route and current provider.
Validate
Confirm compatibility, capacity, emergency information and porting records.
Pilot
Test trunks, routes and selected low-risk services.
Port
Move agreed numbers in controlled stages and confirm every destination.
COMMON QUESTIONS
Before you order.
What is a SIP trunk?
A SIP trunk provides IP-based voice connectivity between a compatible phone platform and public telephone services.
How many channels do we need?
Concurrency should be based on busy-hour inbound and outbound calling, queues, campaigns and continuity needs rather than total users alone.
Can we port our existing DDI range?
Many number ranges can be ported, subject to provider, range ownership, account details and an accepted order.
Can inbound calls fail over elsewhere?
Alternative routing may be possible depending on the service and design. Requirements should be agreed before activation.