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The sipXbridge service is a Back To Back User Agent (B2BUA) that enables NAT traversal and connectivity to an Internet Telephony Service Provider (ITSP). It anchors media and provides rewriting of the SIP / SDP headers so that packets can pass through the firewall / NAT and be routed from an ITSP to the sipXecs server via a NAT and vice versa.
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Interoperable Internet Telephony Service Providers (ITSPs)
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