Carrier-grade UK termination on Tier-1 routes from $0.003/minute — engineered for the all-IP era as BT retires the legacy PSTN and ISDN networks. Full CLI to every UK mobile and fixed-line operator. Ofcom-aligned. 99.99% uptime, geo-redundant.
Network
100% IP
PSTN-OFF READY
Ofcom
Aligned
GC COMPLIANT
UK MNOs
4 / 4
DIRECT INTERCONNECT
The UK is in the largest voice infrastructure transition in its history. BT Openreach is retiring the PSTN and ISDN, with the all-IP migration accelerating across business and residential lines. Every wholesale buyer routing UK traffic — international carriers, UK CPaaS, ITSPs — needs an upstream provider already running on a modern, IP-native voice core.
That's precisely how MCM is built. Direct Tier-1 interconnects with BT, Vodafone, Virgin Media O2 and Three plus regional carriers. SIP-native softswitch fabric. Sub-150ms latency on UK-Europe corridors. Active-active failover across multiple data centre regions.
No legacy TDM
100%
IP-native voice core
BT · VOD · VMO2 · Three
4 / 4
UK MNOs direct
Routing
< 150ms
UK-Europe latency
Geo-redundant
99.99%
Uptime SLA
Ofcom-regulated, scrutinised for CLI integrity, nuisance-call mitigation, and fair use of national numbering. MCM operates within these frameworks so wholesale partners don't absorb the regulatory risk.
Verified caller line identity passed end-to-end on every UK CLI route — critical for ASR and answer-rate on UK mobile networks. Clean signalling from origination to handset.
Operations follow Ofcom's General Conditions for CLI presentation, abandoned-call handling, and number-range integrity.
Origination respects the full UK numbering plan — geographic, non-geographic, mobile, and service ranges.
01/02
Geo
03
Non-geo
07
Mobile
08/09
Service
Automated detection of artificial inflation patterns on UK premium-rate and high-cost destinations — stopped before they hit your invoice.
Traffic crossing into US/Canada from UK origination points is attested at the appropriate level for downstream gateway acceptance.
As ISDN rentals climb during the Openreach switch-off, UK wholesale buyers are repricing their cost stack. The three tiers below give a fixed, published baseline for modelling the all-IP migration — including how residential and SMB customer bases re-economise once line rental disappears and per-minute rates take over.
Starting from
UK BPO, contact centre, outbound dialler campaigns.
Starting from
UK retail VoIP, residential replacement, enterprise voice.
Negotiated
Guaranteed CLI to all UK mobile networks, dedicated UK corridors.
Direct interconnects with the four UK MNOs and major fixed-line carriers. 10,000 CPS switching capacity. 100,000+ concurrent sessions. Geo-distributed media servers anchored in Europe to keep RTP streams close to UK endpoints.
BT
Tier-1 fixed + mobile
Vodafone
Mobile direct
Virgin Media O2
Mobile + fixed
Three
Mobile direct
Codec handling reflects UK voice norms — selected dynamically per call.
46 Labs
VOS
Sippy
OpenSIPS
Asterisk
FreeSWITCH
Standard SIP interconnect. REST APIs for provisioning, dynamic LCR, and real-time CDRs.
Moving residential and SMB customer bases off ISDN before the BT switch-off deadline — onto an upstream that's already 100% IP-native.
ACD against the four UK MNOs is the daily KPI for outbound UK campaigns.
Supplying downstream UK ITSPs that need attested CLI and Ofcom-aligned origination.
EU, US and APAC voice into UK fixed and mobile termination. Direct interconnect, attested CLI, predictable A-Z economics — without the third-hop quality drop.
Same business day SIP credentials. UK sandbox for live ASR/ACD testing. 100% IP-native — no PSTN dependency to re-architect.
MCM is already 100% IP-native. There is no legacy TDM dependency in our UK termination stack, so as BT retires PSTN and ISDN, partners routing through MCM continue without re-architecting their voice path.
UK termination opens from $0.003/minute on Basic CC, with Platinum CC sitting at $0.005/minute. Custom CLI to specific UK mobile or geographic ranges is quoted against committed monthly volume. Most UK buyers request the rate card together with the ISDN-migration plan — we issue both.
Yes. Verified CLI is passed end-to-end on all CLI routes to BT, Vodafone, Virgin Media O2, and Three. CLI integrity is a key driver of UK ASR/ACD, so we keep the signalling clean from origination to handset.
MCM operations follow Ofcom's General Conditions covering CLI presentation, abandoned-call rules, and UK National Numbering Plan integrity. Wholesale partners terminate UK traffic through us with full regulatory traceability.
UK onboarding usually closes within one business day once KYC and Ofcom-aligned origination checks pass. SIP credentials, IP allow-listing and a UK test-number range follow the same day. Our team will set up an ASR/ACD calibration window across BT, Vodafone, VMO2 and Three before you scale UK volume.