SIP Tenders
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".
Stotles tracks 420 notices under this page's filter, 261 awarded and 33 at pre-tender. "SIP trunk" alone accounts for 254. Councils, NHS trusts, universities and fire services all buy it.
407 results
- Awarded contract
WCC - Contact Centre Telephony
- Awarded contract
Contact Centre Telephony
- Expired contract
Gamma SIP Trunk Connectivity
- Awarded contract
Award- Provision of network services
- Awarded contract
CWC22036 SIP Telephony
- Closed tenderPublished 13 January 2023
Supply of an Enterprise Voice and Customer Contact Centre Solution
- Open tenderPublished 12 January 2023
Health and Social Care Network (HSCN) Access Services Extension
- Awarded contract
Supply of an Enterprise Voice and Customer Contact Centre Solution
- Closed tenderPublished 11 January 2023
Supply of an Enterprise Voice and Customer Contact Centre Solution
- Awarded contract
Unified Communications
- Awarded contract
Unified Communications
- Closed tenderPublished 5 January 2023
Gamma SIP Trunk Connectivity
- Closed tenderPublished 5 January 2023
Gamma SIP Trunk Connectivity
- Closed tenderPublished 15 December 2022
NNC CORBY ENTERPRISE CENTRE VOICE AND DATA SUPPOR
- Closed tenderPublished 13 December 2022
Session Border Controllers and Analogue Gateway replacement
- Awarded contract
Telephony Connectivity and Services
- Awarded contract
Telephony and Communication Services Dynamic Purchasing System
- Expired contract
WSCC - JS - SIP and Non SIP Services
- Expired contract
DWP SIP Trunks
- Expired contract
PRF 1359 SIP Services
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?
Two routes. 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. Platform-wide, 2,140 notices are open right now.
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. Of the 50 most recent notices matching this page's filter, most 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. Alongside this page's keyword filter, CPV 64200000 (Telecommunications services) appears on 88 matching notices and 64215000 (IP telephone services) on 49. Neither is applied as a filter here: plenty of on-intent notices carry a broader IT code instead, or no code at all.
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 it returns 420 notices rather than everything tagged telecoms.
How much of the public sector SIP market is already awarded?
Most of it. Of the 420 notices under this filter, 261 are awarded contracts and 33 sit at pre-tender or planning stage. 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. Platform-wide, 0 award notices were published in the last seven days.
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