A SIP provider, also known as a SIP trunk provider, is a company that provides Session Initiation Protocol (SIP) trunking services to businesses. SIP trunking is a technology that allows businesses to connect their on-premises PBX system to the public switched telephone network (PSTN) over an IP connection. This allows businesses to take advantage of the benefits of VoIP, such as lower call costs, increased flexibility, and enhanced features, without having to replace their existing PBX system.
SIP providers offer a variety of services, including: