“SIP service provider” takes up its sources in “Session Initiation Protocol (SIP) trunking”, which means a provider that allows the bulk of users to connect their in-residence IP systems to the PSTN. Session Initiation Protocol is the de-facto …
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“SIP service provider” takes up its sources in “Session Initiation Protocol (SIP) trunking”, which means a provider that allows the bulk of users to connect their in-residence IP systems to the PSTN. Session Initiation Protocol is the de-facto …