BT Global SIP vs IPComms SIP Trunking

BT Global SIP provides VoIP connectivity between an on-premises phone system and the public switched telephone network. Depending on the country, it can replace PSTN/ISDN service completely or provide outbound voice without a full replacement. Features include inbound PSTN traffic, local, regional and national outbound calls, emergency calling, number porting, and DDI reservation and allocation. BT describes integrations with Microsoft Teams, Zoom Meetings, and Cisco Webex. Global SIP Outbound is stated to be available in 73 countries, while full PSTN replacement is available in 24. A cloud self-service portal offers 24/7 ordering, provisioning, and management, with changes taking effect in real time; BT says portal access has no charge. BT also describes end-to-end security, fraud prevention, and monitoring. Its service schedule says Global SIP is not PCI DSS compliant and should not carry payment-card traffic. Pricing is on request, with charges specified in the customer order.

IPComms SIP Trunking connects a business PBX or session border controller to the public telephone network over the internet. The standard trunk has no per-channel fee or fixed channel count; concurrent calls depend on bandwidth and a fraud-protection limit that support can raise on request. SIP signaling is supported over UDP or TCP on port 5060 and TLS on port 5061, with G.711 μ-law, G.711 A-law, and G.729 codecs. IPComms lists two geographically separate US points of presence, inbound delivery to both, and automatic outbound failover. Trunks can use TLS signaling and SRTP media, and calls receive STIR/SHAKEN A attestation. The company lists compatibility with multiple PBX systems, Microsoft Teams Direct Routing, and contact-center connections. Its REST API supports number provisioning, trunk management, sub-account creation, and call-detail retrieval. Usage is billed from a prepaid balance. The service has a free plan, with paid service from $1.50/mo; E911 with a dispatchable location is available for $2.50 per number per month. A 30-day test trunk is available on request with limited call capacity and destinations.