One end breakout meaning

One end breakout describes routing where traffic travels over a private network or dedicated capacity for most of its path and connects to a public electronic communications network (PECN/PSTN) only at one end (either origination or termination). For example: (i) a UK communications provider collects traffic on leased lines or an IP‑VPN, carries it internationally on private capacity, then hands it off to a foreign PECN for termination; or (ii) a foreign provider collects traffic off a private network abroad and hands it off to a UK PECN for termination. This is a descriptive industry and regulatory term, not generally defined in legislation or case law. Its legal significance turns on where breakout occurs. The breakout jurisdiction’s regime will govern interconnection, termination rates and charging, numbering and CLI presentation, emergency call access, lawful interception, data retention, and any notification/authorisation requirements for providing electronic communications networks or services. It commonly features in wholesale carriage, international transit and VoIP gateway agreements, and in Ofcom/ComReg regulatory contexts and disputes. Usage is broadly consistent across England & Wales, Scotland, Northern Ireland and Ireland, though applicable charge controls, interconnection conditions and authorisation procedures differ between Ofcom and ComReg frameworks.