O2 Business SIP Trunking

Spec sheet

Purpose

SIP Trunking offers an ISDN migration path for buyers who want to retain a PBX.Read 8 Oct 2026 · applytosupply.digitalmarketplace.service.gov.uk

Audience

O2 describes its SIP Trunking service as intended for businesses with a PBX, including small businesses, enterprises, and public sector organisations.Read 8 Oct 2026 · static-www.o2.co.uk

Security

The listing reports ISO/IEC 27001 certification, Cyber Essentials and Cyber Essentials Plus, and ISO 22301 and ISO 20000 certifications.Read 8 Oct 2026 · applytosupply.digitalmarketplace.service.gov.uk

Support

The listing offers phone support 24 hours a day, 7 days a week, and lists target restoration times by incident priority.Read 8 Oct 2026 · applytosupply.digitalmarketplace.service.gov.uk

Headquarters

Slough, Berkshire, UKRead 28 Sep 2026 · o2.co.uk

Availability

The marketplace listing states guaranteed platform availability of 99.999% under an SLA.Read 8 Oct 2026 · applytosupply.digitalmarketplace.service.gov.uk

Call charging

Outbound calls can use PAYG per-minute or per-call charging, or a flat-rate tariff with included call allowances.Read 8 Oct 2026 · assets.applytosupply.digitalmarketplace.gov.uk

Connectivity

The service can use supplier IPVPN/SD-WAN or internet services, or third-party internet access.Read 8 Oct 2026 · assets.applytosupply.digitalmarketplace.service.gov.uk

Features

Listed features include anonymous call reject, incoming and outbound call barring, call diverts, CLIP, CLIR, and new or ported numbers.Read 8 Oct 2026 · applytosupply.digitalmarketplace.service.gov.uk

Number porting

Geographic single-line and multi-line numbers can be ported from other licensed operators to the service.Read 8 Oct 2026 · assets.applytosupply.digitalmarketplace.gov.uk

Portal

The optional web portal lets administrators manage calling features and view inbound and outbound call reports.Read 8 Oct 2026 · assets.applytosupply.digitalmarketplace.gov.uk

Reporting

Portal users can create or schedule call reports and download call logs in CSV format.Read 8 Oct 2026 · assets.applytosupply.digitalmarketplace.gov.uk

Requirements

Buyers must use approved Session Border Controllers configured to the supplied guides and provide compatible IPVPN/SD-WAN or internet access.Read 8 Oct 2026 · applytosupply.digitalmarketplace.service.gov.uk

Resilience

The listing states that each SIP trunk has platform-side resilience across two geographically resilient points of presence, with optional dual-trunk active/standby or active/active configurations.Read 8 Oct 2026 · applytosupply.digitalmarketplace.service.gov.uk

Scalability

The service definition says capacity can range from 15 to 5,000 SIP channels, with more available by discussion with the supplier.Read 8 Oct 2026 · assets.applytosupply.digitalmarketplace.service.gov.uk

Plans and prices

Every O2 Business SIP Trunking plan and price →

Where Specifiction places it

• SIP Trunking Providers#13 of 277.3