Asterisk

Notes on oslec codec with asterisk

To recompile after yum update or change of kernel.

yum update

re load, if new kernel

should be a symbolic link from /usr/src/dadhi to asteriskversion/dahdi-linux-x.x.x

cd to it

make clean

make

make install

see notes on using echo cancelling with oslec to setup the software.

Setting up oslec with dahdi drivers and asterisk

the install:

cd /usr/src

create a sym link dir to the linux-dahdi-drivers directory

wget http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.28.tar.bz2
tar xjf linux-2.6.28.tar.bz2
mkdir /usr/src/dahdi/drivers/staging
cp -fR /usr/src/linux-2.6.28/drivers/staging/echo /usr/src/dahdi/drivers/staging
sed -i "s|#obj-m += dahdi_echocan_oslec.o|obj-m += dahdi_echocan_oslec.o|" /usr/src/dahdi/drivers/dahdi/Kbuild
sed -i "s|#obj-m += ../staging/echo/|obj-m += ../staging/echo/|" /usr/src/dahdi/drivers/dahdi/Kbuild
echo 'obj-m += echo.o' > /usr/src/dahdi/drivers/staging/echo/Kbuild
cd /usr/src/dahdi/
make
make install

Sample configs:

don't forget the "options wctdm opermode=UK" in /etc/modprobe.d/dahdi.conf

eg1 (two cards) /etc/dahdi/system.conf

# Autogenerated by /usr/sbin/dahdi_genconf on Tue Dec  1 09:10:15 2009
# If you edit this file and execute /usr/sbin/dahdi_genconf again,
# your manual changes will be LOST.
# Dahdi Configuration File
#
# This file is parsed by the Dahdi Configurator, dahdi_cfg
#
# Span 1: WCFXO/0 "Wildcard X100P Board 1" (MASTER) 
fxsks=1
echocanceller=oslec,1

# Span 2: WCTDM/4 "Wildcard TDM400P REV E/F Board 5" 
fxsks=2
echocanceller=oslec,2
# channel 3, WCTDM/4/1, no module.
# channel 4, WCTDM/4/2, no module.
# channel 5, WCTDM/4/3, no module.

# Global data

loadzone	= uk
defaultzone	= uk

and /etc/asterisk/dahdi-channels.conf included by /etc/asterisk/chan_dahdi.conf

Eg 2: one card

# Autogenerated by /usr/sbin/dahdi_genconf on Sat Dec  5 11:11:05 2009
# If you edit this file and execute /usr/sbin/dahdi_genconf again,
# your manual changes will be LOST.
# Dahdi Configuration File
#
# This file is parsed by the Dahdi Configurator, dahdi_cfg
#
# Span 1: WCTDM/4 "Wildcard TDM400P REV E/F Board 5" (MASTER) 
fxsks=1
echocanceller=oslec,1
# channel 2, WCTDM/4/1, no module.
# channel 3, WCTDM/4/2, no module.
# channel 4, WCTDM/4/3, no module.

# Global data

loadzone	= uk
defaultzone	= uk

and the /etc/asterisk/dahdi.conf

; Autogenerated by /usr/sbin/dahdi_genconf on Sat Dec  5 11:11:06 2009
; If you edit this file and execute /usr/sbin/dahdi_genconf again,
; your manual changes will be LOST.
; Dahdi Channels Configurations (chan_dahdi.conf)
;
; This is not intended to be a complete chan_dahdi.conf. Rather, it is intended
; to be #include-d by /etc/chan_dahdi.conf that will include the global settings
;

; Span 1: WCTDM/4 "Wildcard TDM400P REV E/F Board 5" (MASTER) 
;;; line="1 WCTDM/4/0 FXSKS  (SWEC: OSLEC)"
signalling=fxs_ks
callerid=asreceived
group=0
context=pstn
channel => 1

Dahdi time shift error on xen

In /ets/sysctl.conf

#Dahdi time shift logs errors (this should stop it)
xen.independent_wallclock = 1