SIP trunking and PRI both facilitate voice communications, but through very different capabilities. Learn the pros and cons of SIP vs. PRI, from costs to deployment models.

SIP trunking and PRI both facilitate voice communications, but through very different capabilities. Learn the pros and cons of SIP vs. PRI, from costs to deployment models.
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SIP trunking is a voice over IP and streaming media service based on the Session Initiation Protocol. SIP trunks allow multiple simultaneous streams of VoIP calls to be routed through a carrier’s network and delivered to an organization as voice packets.
SIP trunking services are sold by internet telephony service providers and provide telephone and unified communications services to customers that have SIP-based PBXs and UC systems.
In millions of global installations, customers use SIP trunks exclusively, which connect them to digital UC options. In many cases, SIP trunking has completely substituted the well-known T1/E1 and Primary Rate Interface (PRI) connections to the public switched telephone network (PSTN) because it offers easier and more inexpensive ways to connect. To determine which technology is right for your organization, compare SIP vs. PRI to understand their costs, capabilities and limitations.
Pros and cons of SIP trunking
SIP trunks operate using the Internet Protocol. If the phone system uses VoIP and operates over the data network, then SIP trunks are a native IP extension of their phone system to the PSTN. In many cases, the entire phone platform is also running the SIP protocol for internal setup and signaling. Thus, the SIP trunk is simply the same protocol used as a bridge to connect the local PBX to the outside world.
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