# SIP Trunking Explained SIP trunking connects an IP-PBX or business voice platform to a telecom carrier over an IP network so organisations can make and receive business calls without traditional physical voice trunks. ## How SIP trunks work A SIP trunk carries signalling and media between the business voice system and the carrier. The design can include number ranges, concurrent call channels, routing, security and redundancy. ## Key buying considerations Businesses should evaluate concurrent channels, number portability, call routing, failover, security, service support, network quality and regulatory requirements. ## SIP trunk versus cloud telephony A SIP trunk is primarily a carrier connectivity layer for a compatible PBX or voice platform. Cloud telephony generally provides a broader managed application layer including IVR, call routing, recording, analytics and browser-based calling. ## Common use cases SIP trunks are used by enterprises, contact centres, branch networks and organisations migrating from legacy PRI or other traditional voice connectivity.
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