System information

Additionally, OpenR2 contains some sample configuration files for connecting Asterisk
to networks in various countries. To read information about some of the country var-
iants, search the /doc/asterisk folder and refer to the documents inside the appropriate
subdirectory:
$ ls doc/asterisk/
ar br ec mx ve
As an example, OpenR2 provides a sample configuration for connecting to Telmex or
Axtel in Mexico. We’ll step you through this to give you an idea of the process. First,
you must configure DAHDI by modifying /etc/dahdi/system.conf as shown here:
loadzone = us
defaultzone = us
span = 1,1,0,cas,hdb3
cas = 1-15:1101
cas = 17-31:1101
span = 2,1,0,cas,hdb3
cas = 32-46:1101
cas = 48-62:1101
Next, you must configure Asterisk by modifying /etc/asterisk/chan_dahdi.conf as
follows:
signalling = mfcr2
mfcr2_variant = mx
mfcr2_get_ani_first = no
mfcr2_max_ani = 10
mfcr2_max_dnis = 4
mfcr2_category = national_subscriber
mfcr2_mfback_timeout = -1
mfcr2_metering_pulse_timeout = -1
; this is for debugging purposes
mfcr2_logdir = log
mfcr2_logging = all
; end debugging configuration
channel => 1-15
channel => 17-31
Configuring analog circuits
There are many companies producing PSTN cards for Asterisk. The card will need to
have its drivers installed so that Linux can recognize it (DAHDI ships with these drivers
for Digium cards). From that point, configuration is handled by the Asterisk module
chan_dahdi.
You can use dahdi_hardware and lsdahdi to determine what telephony
hardware your system contains.
142 | Chapter 7: Outside Connectivity