bridge
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... critical to the
instantiation of features is lost when SIP bridges calls between two
segments of the PSTN ...
... PSTN
is referred to as 'SIP bridging'. When a call destined for the SIP
network originates in the PSTN, an SS7 ...
... restricted to licensed carriers; SIP-T introduces some challenges in
so far as it bridges carrier signaling with end-user signaling ...