Technical data

This section describes step-by-step how to set up a dial-in server using mgetty and pppd applications.

The dial-in server is built using the mgetty and pppd utilities. mgetty is responsible for TTY interface

initialization and call answering. pppd provides a method for transmitting datagrams over point-to-point links

and is responsible for link control, authentication, and for network protocol configuration.

The Dialogic

Diva

TTY interface is set in auto-detection mode. In this mode, the TTY driver will detect the type

of the used protocol and PPP framing and will convert it to ASYNC PPP. This allows the calls to be served by

pppd in the same way.

Setting up a "ppp" dial-in server

To set up a dial-in server, proceed as described below:

1. Make sure that the mgetty+sendfax package is installed on your system.

2. Change the context of the /etc/mgetty+sendfax/mgetty.config file as follows:

# set the global debug level to "4" (default from policy.h)

#debug 9

# access the modem(s) with 38400 bps

speed 38400

# This is 33600 only

#init-chat "" AT&F14;S0=0;E0;\\V1#CID=1;+ms=v34,1 OK

init-chat "" AT&F14+IF5+IM4;S0=0;E0;\\V1#CID=1 OK

data-only y

blocking no

toggle-dtr no

modem-type data

modem-check-time 0

autobauding no

answer-chat-timeout 180

3. Change the context of the /etc/mgetty+sendfax/login.config file as follows:

# Automatic PPP startup on reception of LCP configuration request (AutoPPP).

# mgetty has to be compiled with "-DAUTO_PPP" for this to work.

/AutoPPP/ - a_ppp /usr/sbin/pppd modem

# Disable login sessions

* - - /bin/false @

4. Add the following lines to the /etc/inittab file, one for every Diva TTY interface that you plan to use for your

dial-in server.

SXX:2345:respawn:/usr/sbin/mgetty ttydsXX

"XX" is the Dialogic

Diva

TTY device number (01, 02, etc.). For example, if one Dialogic

Diva

BRI Media

Board with 2 channels is installed in the system, you should add two entries:

S01:2345:respawn:/usr/sbin/mgetty ttyds01 S02:2345:respawn:/usr/sbin/mgetty ttyds02

How to set up a dial-in server