Chapter 3: Configuration
Configuring Card Features
You will need to modify the
chan_dahdi.conf
file which is located in the
/etc/asterisk directory in order to configure the essential features of your
card. This file is the configuration layer between DAHDI and Asterisk.
Switchtype:
national:
dms100:
National ISDN 2 (default)
Nortel DMS100
4ess:
AT&T 4ESS
5ess:
Lucent 5ESS
euroisdn:
EuroISDN
ni1:
Old National ISDN 1
qsig:
Q.SIG
Echocancel:
Echo Cancellation is enabled in chan_dahdi.conf by preceding the
channel variable with a variable called echocancel and a value of yes; for
example:
echocancel = yes
channel => 1-23
By default, and when setting to "yes," echo cancellation is enabled and set
to 128 ms (1024 taps). Echo cancellation is explicitly disabled by setting:
echocancel = no
Digium does not recommend that users set echo cancellation to "no."
The integrated hardware echo cancellation will have 128ms of echo
cancellation performed at all times unless explicitly disabled by setting
the echocancel option equal to "no."
Digium, Inc.
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