Technical data

4. Packages
• ISDN_CIRC_x_CALLBACK=’out’:
In this case ISDN_CIRC_x_CBDELAY is the ringing timespan for the other party until
fli4l waits for callback. ISDN_CIRC_x_CBDELAY=’3’ is a good rule of thumb here ei-
ther. On long distance calls it takes up to 3 seconds untils the other router is even
recognizing the call. If in doubt simply try.
If setting ISDN_CIRC_x_CALLBACK=’off’, ISDN_CIRC_x_CBDELAY is ignored. This variable is
ignored with CallBack Control Protocol as well.
ISDN_CIRC_x_EAZ In the example the MSN (called EAZ here) is set to 81330. Set your
own MSN *without* area code here.
Depending on your telephony system only the extension station number could be neces-
sary. Setting an additional ’0’ may also help sometimes.
This variable may be empty which can help with some telephony systems as well.
ISDN_CIRC_x_SLAVE_EAZ If fli4l is connected on the internal S0-Bus of a telephony sys-
tem and you want to use channel bundeling you may have to specify a second extension
station number for the slave channel.
Normally this variable can stay empty.
ISDN_CIRC_x_DEBUG If ipppd should display additional debug informations set ISDN_-
CIRC_x_DEBUG to ’yes’. Ipppd will log these informations to syslog then.
IMPORTANT: To use syslogd for logging OPT_SYSLOGD has to be set to ’yes’.
(See OPT_SYSLOGD - Program For Protocolling System Messsages (Page 73)) Some
messages are logged to klogd so OPT_KLOGD (See OPT_KLOGD - Kernel-Message-Logger
(Page 75)) should be set to ’yes’ as well for debugging ISDN.
For Raw-IP-Circuits ISDN_CIRC_x_DEBUG has no meaning.
ISDN_CIRC_x_AUTH If the circuit is also used for dial-in and an authentification over PAP
or CHAP should be used by the calling party set ISDN_CIRC_x_AUTH to ’pap’ or ’chap’ -
but *only* then. In all other cases this variable has to be empty!
Cause: An Internet provider will never authentificate with you - but there may be ex-
ceptions to this rule.
Use the entries ISDN_CIRC_x_USER and ISDN_CIRC_x_PASS for username and password.
For Raw-IP-Circuits this variable has no meaning.
ISDN_CIRC_x_HUP_TIMEOUT ISDN_CIRC_x_HUP_TIMEOUT sets the time after that fli4l dis-
connects from the provider if no traffic is detected over the connection. In the example
the connection will be hung up after 40 seconds idle time to save money. On new accesses
fli4l connects again in a short timespan. This makes sense especially with providers that
have seconds charge intervals!
At least while testing you should keep an eye on fli4l’s automatic dial-in and hangup
using either console or imon-client. In case of faulty configuration the ISDN connection
could become an unwanted permanent line.
Setting this to ’0’ means that fli4l doesn’t use idle time and won’t hang up by itself
anymore. Use with care!
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