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ZyXEL Communications P-334W User Manual

Page 451

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Prestige 334W User’s Guide

PPTP B-3

The control connection runs over TCP. Similar to L2TP, a tunnel control connection is first established
before call control messages can be exchanged. Please note that a tunnel control connection supports multiple
call sessions.

The following diagram depicts the message exchange of a successful call setup between a PC and an ANT.

Diagram B-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.