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PPTP E-3
Diagram E-3 Example Message Exchange between PC and an ANT
PPP Data Connection
The PPP frames are tunneled between the PNS and PAC over GRE (General Routing
Encapsulation, RFC 1701, 1702). The individual calls within a tunnel are distinguished using the
Call ID field in the GRE header.
Contivity 221 VPN Switch User's Guide
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