You will have to remove these files or at least
move them out of their respective directories.

remove these files from the /usr/src/asterisk/channels directory:
-----------------------------------------------------------------
chan_echolink.c
chan_echolink.so
chan_irlp.c
chan_irlp.so

remove these files from the /usr/lib/asterisk/modules
-----------------------------------------------------
chan_echolink.so
chan_irlp.so

remove these files from the /etc/asterisk directory
-------------------------------------------------
echolink.conf
irlp.conf


Also, make sure you have these statements
in /etc/asterisk/modules.conf 
under the [modules] section:

noload=chan_echolink.so
noload=chan_irlp.so


The Asterisk CD ISO's, that most people install, expect that you
have a modified USB sound fob (cost is $5) or a URI board(cost is $99)
If one of these is not plugged in when you start Asterisk or
when the system boots, then the Asterisk server crashes and it
becomes a "ZOMBIE" process and Asterisk becomes unsuable.
So, if you dont have one of these boards or one of them is not installed
and plugged in, or you dont intend to TX/RX using one of these boards,
but want to TX/RX using rtpDir bridge, 
remove /usr/lib/asterisk/modules/chan_usbradio.so,
remove /etc/asterisk/usbradio.conf
and add the noload statement 
noload=chan_usbradio.so to /etc/asterisk/modules.conf file


The only files that are required are:
--------------------------------------
/usr/src/asterisk/channels/chan_rtpdir.c

and make sure
that in /etc/rpt.conf one of your nodes
has this:
rxchannel=rtpdir/0.0.0.0:4570:4670

because it will be chan_rtpdir driver and
rtpDir(or rtpDir_tm) server that will
provide access to IRLP, Echolink, Asterisk and D-Star.

If you dont have a URI board or a modified USB sound fob
(dongle for Asterisk use)
do NOT have any statement like the following
in /etc/rpt.conf otherwise your Asterisk server will
always crash and become a Linux "ZOMBIE" process which is
useful as a bag of hammers.

rxchannel = Radio/usb

The above rxchannel statement must be removed or
replaced with
rxchannel=rtpdir/0.0.0.0:4570:4670


Then rebuild the Asterisk server from within the /usr/src/asterisk
directory, by executing these commands:

gmake
gmake install

73,
de KI4LKF