O2 Business SIP Trunking

Name: O2 Business SIP Trunking
Price: 1 GBP

Web· paid plans from £1/mo

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Freedom report

One barScore 5.0

Free tierNo free tier
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

O2 Business SIP Trunking is ranked #22 of 30 in SIP trunking providers on Freedom251. It runs on Web. There is no free plan. Paid plans start at £1/mo.

O2 Business SIP Trunking plans and pricing

All plans

SIPT Back Up Channel £1/mo Per channel per month; 24-month term; minimum 20 users Underlying SIP access excluded assets.applytosupply.digitalmarketplace.service.gov.uk · 8 Oct 2026

SIPT Channel Standard £4.50/mo Per channel per month; 24-month term; minimum 20 users Underlying SIP access excluded assets.applytosupply.digitalmarketplace.service.gov.uk · 8 Oct 2026

IP Voice (SIP Trunking) £4.50/mo Per instance per month G-Cloud 14 listing; required underlying SIP access may be additional applytosupply.digitalmarketplace.service.gov.uk · 8 Oct 2026

SIPT Channel Standard including mins £6/mo Per channel per month; 24-month term; minimum 20 users Fair Use Policy applies; underlying SIP access excluded assets.applytosupply.digitalmarketplace.service.gov.uk · 8 Oct 2026

SIPT Channel Geo and Network Resilient £14/mo Per channel per month; 24-month term; minimum 20 users Fair Use Policy applies; underlying SIP access excluded assets.applytosupply.digitalmarketplace.service.gov.uk · 8 Oct 2026

Compared on SIP trunking providers

Free plan: No
Pricing model: per-minute
Number porting: Yes
Emergency calling: Yes
Toll-free numbers: Yes

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The record

Purpose: SIP Trunking offers an ISDN migration path for buyers who want to retain a PBX.
Connectivity: The service can use supplier IPVPN/SD-WAN or internet services, or third-party internet access.
Scalability: The service definition says capacity can range from 15 to 5,000 SIP channels, with more available by discussion with the supplier.
Features: Listed features include anonymous call reject, incoming and outbound call barring, call diverts, CLIP, CLIR, and new or ported numbers.
Call charging: Outbound calls can use PAYG per-minute or per-call charging, or a flat-rate tariff with included call allowances.
Portal: The optional web portal lets administrators manage calling features and view inbound and outbound call reports.
Reporting: Portal users can create or schedule call reports and download call logs in CSV format.
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.
Availability: The marketplace listing states guaranteed platform availability of 99.999% under an SLA.
Security: The listing reports ISO/IEC 27001 certification, Cyber Essentials and Cyber Essentials Plus, and ISO 22301 and ISO 20000 certifications.
Support: The listing offers phone support 24 hours a day, 7 days a week, and lists target restoration times by incident priority.
Requirements: Buyers must use approved Session Border Controllers configured to the supplied guides and provide compatible IPVPN/SD-WAN or internet access.
Audience: O2 describes its SIP Trunking service as intended for businesses with a PBX, including small businesses, enterprises, and public sector organisations.
Headquarters: Slough, Berkshire, UK
Price from: £1/mo

Where it ranks on Freedom251

Best SIP Trunking Providers in 2026#22 of 30

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Sources

applytosupply.digitalmarketplace.service.gov.uk/g-cloud/services/575492817477609· checked 8 Oct 2026
assets.applytosupply.digitalmarketplace.service.gov.uk/g-cloud-14/documents/706765/57549281747· checked 8 Oct 2026
assets.applytosupply.digitalmarketplace.gov.uk/g-cloud-14/documents/706765/57549281747· checked 8 Oct 2026
static-www.o2.co.uk/sites/default/files/2019-04/SIP%20Trunk· checked 8 Oct 2026
o2.co.uk/business/sip-trunking· checked 28 Sept 2026
assets.applytosupply.digitalmarketplace.service.gov.uk/g-cloud-14/documents/706765/57549281747· checked 8 Oct 2026