ZyXEL 202H 91-003-194003B User Manual

P-202H Plus v2 User’s Guide

Chapter 12 NetCAPI

140

This chapter covers the NetCAPI screen.

Your ZyXEL Device supports NetCAPI. NetCAPI is ZyXEL's implementation of CAPI 
(Common ISDN Application Program Interface) capabilities over a network. It runs over DCP 
(Device Control Protocol) developed by RVS-COM.

NetCAPI can be used for applications such as Eurofile transfer, file transfer, G3/G4 Fax, 
Autoanswer host mode, telephony, etc. on Windows 95/98/NT platforms. 

CAPI is an interface standard that allows applications to access ISDN services. Several 
applications can share one or more ISDN lines. When an application wants to communicate 
with an ISDN terminal it sends a series of standard commands to the terminal. The CAPI 
standard defines the commands and allows you to use a well-defined mechanism for 
communications using ISDN lines.

CAPI also simplifies the development of ISDN applications through many default values that 
do not need to be programmed. It provides a unified interface for applications to access the 
different ISDN services such as data, voice, fax, telephony, etc.

ISDN-DCP allows a computer on the LAN to use services such as transmitting and receiving 
faxes as well as placing and receiving phone calls. 

Using ISDN-DCP, the ZyXEL Device acts as a DCP server. By default, the ZyXEL Device 
listens for DCP messages on TCP port number 2578 (the Internet-assigned number for RVS-
COM DCP). When the ZyXEL Device receives a DCP message from a DCP client i.e., a 
computer, the ZyXEL Device processes the message and acts on it. Your ZyXEL Device 
supports all the DCP messages specified in the ISDN-DCP specification.