ZyXEL Communications Prestige 316 User Manual page 154

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Control Connection
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.
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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.
PPTP
Prestige 316 Broadband Sharing Gateway / Wireless LAN
Diagram 5. Control Connection
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