SIP trunks perform some key call and session control and management functions, and serve in place of traditional access lines and trunks.ix Typically provisioned by carriers over T1 trunks, carrier-based SIP trunk services interface between carriers’ nodes and SIP-enabled customer premises equipment, such as a SIP gateway or IP PBX.x SIP Trunks also interconnect customer sites with hosted VOIP/IP centrex services, cloud/software as a service (SaaS) applications, and facilitate customer connectivity with IMS-based applications, like single number service (see sidebar). At the carrier, SIP Trunks interconnect to IP-based WAN services, VOIP/multimedia-enabled network nodes and from these, to the public switched telephone network (PSTN).
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SIP Trunking - The cornerstone of unified communications
1. Strategic Networks Group
Insight to Move Forward
SIP Trunk Services: The Cornerstone of Unified
Communications
First in a Series on the Migration to Converged Networks
December 16, 2009
Lisa Pierce
lpierce@strategicnw.com
WP101194 3/10