ZyXEL Communications 202H User Manual

Prestige 202H User’s Guide 

ISDN Setup 

 

5-5 

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

This section describes how to configure your Prestige to be a NetCAPI server. 

By default, NetCAPI is enabled on your Prestige.

 

When NetCAPI is enabled, the Prestige listens for 

incoming DCP messages from the computers. By default, the Prestige listens for DCP messages on TCP port 
2578.