SIP Tenders and Contracts
See open SIP tenders and awarded contracts for the UK public sector.
SIP procurement is the voice side of the PSTN switch-off: SIP trunks, SIP channels and SIP lines replacing ISDN circuits, plus the session border controllers and Microsoft Teams direct-routing work around them. Buyers seldom put SIP in the title. It sits in the description of a notice called "telephony" or "fixed voice services".
Councils, NHS trusts, universities and fire services all buy it.
425 results
- Closed tenderPublished 10 November 2015
Broadacres WAN & Services Tender
£125,000
- Closed tenderPublished 31 July 2015
HBC - Unified Communication Telephony System
£600,000
- Expired contractPublished 19 June 2015
Provision of SIP Trunk Services
£2,300
- Expired contractPublished 1 June 2015
Supply and Support of Session Initiation Protocol (SIP) Telephony
£199,345
- Expired contractPublished 1 June 2015
Supply and Support of Session Initiation Protocol (SIP) Telephony
£150,383
Frequently asked questions
Frequently asked questions about sip trunk, session initiation protocol, sip service, sip line, sip channel, sip telephony, sip connectivity, sip solution in the UK public sector.
How do I find SIP tenders in the UK public sector?
Watch the portals for notices with SIP in the title, which is the smaller half of the market, or search the descriptions, where most of it actually lives. Stotles aggregates 100+ portals and indexes the full notice text, so a telephony contract that mentions SIP only in its requirement detail still surfaces.
Why do so few notices have SIP in the title?
Because SIP is a component, not a category. Buyers procure "telephony services", "fixed voice" or "unified communications" and specify SIP trunks inside the requirement. Most notices matching this page's filter carry a title that never says SIP. Reading descriptions is the only way to find them.
What CPV codes cover SIP contracts?
SIP work sits in the telecoms services branch of the vocabulary. A general telecommunications services code and a narrower IP telephone services code are the two that turn up most.
Is SIP the same as VoIP?
No. VoIP is voice carried over IP. SIP is the signalling protocol that sets those calls up and tears them down. In procurement the two words often land in the same notice, so a supplier chasing trunk work should watch the broader voice and telecom pages too. This page filters on SIP-specific phrasing only, which is why its count runs lower than everything tagged telecoms.
How much of the public sector SIP market is already awarded?
Most of it. Open tenders are a thin slice at any one moment, so the awarded set is where the useful detail is: who bought, from whom, and when the term ends.
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