Technical data

4. Packages
Important: If calls should be logged with telmond don’t set this value lower than 2
otherwise telmond would lack informations for logging.
Default setting: ISDN_VERBOSE_LEVEL=’2’
ISDN_FILTER Activates filtering mechanism of the kernel to achieve hangup after
the specified hangup timeout. See http://www.fli4l.de/hilfe/howtos/basteleien/
hangup-problem-loesen/ for additional informations.
ISDN_FILTER_EXPR Specifies the filter to use if ISDN_FILTER is set to ‘yes’.
4.13.3. OPT_ISDN_COMP (EXPERIMENTAL)
OPT_ISDN_COMP=’yes’ activates LZS- and BSD-compression. Credits for this go to Arwin Vos-
selman (email: arwin(at)xs4all(dot)nl). This addon package is in experimental state.
Default setting: OPT_ISDN_COMP=’no’
The needed parameters for LZS-compression in detail:
ISDN_LZS_DEBUG (EXPERIMENTAL) Debug-level-settings:
’0’ no debugging informations
’1’ normal debugging informations
’2’ enhanced debugging informations
’3’ extreme debugging informations (incl. dumping of data packets)
Default setting: ISDN_LZS_DEBUG=’1’
ISDN_LZS_COMP (EXPERIMENTAL) Compression level (not decompression!). Please use
value 8. Values from 0 to 9 are possible.
Higher numbers will compress better at the cost of higher CPU load with 9 being dis-
proportional excessive.
Default setting: ISDN_LZS_COMP=’8’
ISDN_LZS_TWEAK (EXPERIMENTAL) Keep this value at ’7’ at the moment.
Default setting: ISDN_LZS_TWEAK=’7’
Beside this three values the variable ISDN_CIRC_x_FRAMECOMP has to be set (see next chap-
ter).
4.13.4. ISDN-Circuits
More connections over ISDN can be defined in fli4l configuration. A maximum of two at a
time is possible over one ISDN card.
Definition of connections is done by so-called circuits. One circuit is used per connection.
In the config.txt example two circuits are defined:
• Circuit 1: Dialout over Internet-by-call provider Microsoft Network, Sync-PPP
• Circuit 2: Dialin/Dialout to an ISDN-router (maybe another fli4l) over Raw-IP, i.e. as
a connection to a company net somewhere.
150