User`s guide

VoiceFinder AP200 VoIP Residential Gateway (RGW) User’s Guide Version 1.1
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4.2.4. PPP Configuration
Point to Point Protocol (PPP) is one of standard transmission rules to send data
through the WAN link. RFC1661 describes PPP specifications. Not only in the
synchronous WAN (serial) line but also in the asynchronous WAN (dial-up line)
PPP can be used. Since PPP is a standard rules, it guarantees compatibility
with different manufacturers’ devices.
VoiceFIner AP160 dial-up VoIP gateway has an internal dial-up modem chip on
board. The PSTN line is connected to PSTN modem port of AP160 directly. Users
should set encapsulation mode as a PPP protocol mode for VoIP service via
PSTN modem.
PPP consists of two kinds of protocol as follows:
z Link Control Protocol (LCP): LCP decides the encapsulation format, limits
the packet size, performs authentication in the link, decides normal
operation time and breakdown time, detects loopback link faults and other
faults, and automatically terminates the link.
z Network Control Protocol (NCP): NCP communicates with various higher
layer (network layer) protocols.
If a PPP encapsulation option is given to VoiceFinder AP160 dial-up VoIP
gateway, PPP operation is possible. Current software installed in the router
supports CHAP(Challenge Handshake Authentication Protocol) the
authentication option that uses PAP(Password Authentication Protocol) and
the magic number configuration option. Software always sends the magic
number configuration option. However, software sends the authentication
option only when the authentication option is set.
Information