SIP trunks, number ranges, international DDIs and wholesale voice — pick the carriers that underpin your phone system, contact centre or reseller business.
Behind every cloud phone system is a carrier — and the choice of carrier shapes call quality, resilience, regulatory posture and per-minute cost. We help businesses, contact centres and resellers compare SIP trunking, wholesale voice and international numbering across tier-1 providers.
The capabilities we look for when shortlisting providers in this category.
Channel- and burst-based SIP trunks with high availability and full geographic redundancy.
Local-presence numbers in 80+ countries with native answer-supervision and CLI delivery.
Project-managed porting from any UK carrier — including stubborn legacy ranges.
Real-time fraud monitoring, geographic call diversion and dual-carrier resilience.
Dual-carrier SIP with intelligent routing, geo-redundancy and a single porting partner.
High-channel SIP with low per-minute rates and inbound capacity that bursts on demand.
Wholesale voice termination, origination and number ranges to power your platform.
International DDIs and centralised SIP termination wherever your customers call from.
Two phone systems on the same UCaaS platform can deliver wildly different call quality depending on the carrier underneath. Carrier choice affects MOS scores, post-dial delay, regulatory compliance and — for high-volume estates — the bottom-line cost per minute.
SIP trunking is the right model for end-customers connecting a PBX or UCaaS platform to the PSTN. Wholesale voice is for service providers carrying other people's traffic. We compare both, depending on which side of the table you're on.
A bad porting project can take a business off-air for hours. We work with carriers that have proper porting desks, realistic timelines and the legal know-how to wrestle ranges off uncooperative incumbents.
Yes — most modern PBX and UCaaS platforms support active-active dual-carrier SIP for resilience and load-balancing.
Single-line UK ports complete in 5–10 working days; multi-line and international ports vary from 2–8 weeks depending on the losing carrier.
Yes — we compare wholesale voice, origination and DDI providers for service-provider customers as well as end users.
Answer a few questions and we'll shortlist the best-fit providers for your business — free, fast and unbiased.
Business Connectivity
Reliable, business-grade internet — leased lines, FTTP, SD-WAN and 5G failover — so your phones, apps and people never miss a beat.
AI Services
AI receptionists, voice agents, transcription and conversational analytics — applied to the calls and conversations your business already has.
Business Mobiles
Handsets, plans and mobile device management — bundled with your business calling for a single bill and a single support number.
SIM Only
Flexible SIM-only business plans with pooled data, no handset markup and short or rolling contracts.