para que no se corten las llamadas por ruido

en chan_dahdi.conf:
mfcr2_advanced_protocol_file=/usr/etc/r2proto.conf

en /usr/etc/r2proto.conf
timers.cas_persistence_check=180

Para configurar el REDFONE desde el servidor asterisk

Configuracion system.conf para redfone.
eth0/00:50:c2:65:xx:xx se sustituye por la mac del servidor asterisk

##Automatically Generated dahdi configuration file
##Generator Version 0.3.3
dynamic=ethmf,eth0/00:50:c2:65:xx:xx /0,31,0
dynamic=ethmf,eth0/00:50:c2:65:xx:xx /1,31,0
dynamic=ethmf,eth0/00:50:c2:65:xx:xx /2,31,0
dynamic=ethmf,eth0/00:50:c2:65:xx:xx /3,31,1
cas=1-15:1101
dchan=16
cas=17-31:1101
alaw=1-31
cas=32-46:1101
dchan=47
cas=48-62:1101
alaw=32-62
cas=63-77:1101
dchan=78
cas=79-93:1101
alaw=63-93
cas=94-108:1101
dchan=109
cas=110-124:1101
alaw=94-124
　
loadzone=us
defaultzone=us

Configuracion chan_dahdi para redfone en México

Esta es la configuracion basica


[trunkgroups]

[channels]
busydetect = yes
Languaje=es
signalling=mfcr2
mfcr2_variant=mx
mfcr2_get_ani_first=no
mfcr2_max_ani=10
mfcr2_max_dnis=4
mfcr2_category=national_subscriber
mfcr2_logdir=span1
mfcr2_logging=all
mfcr2_call_files=yes
;mfcr2_mfback_timeout=-1
;mfcr2_metering_pulse_timeout=450
mfcr2_metering_pulse_timeout=-1
mfcr2_advanced_protocol_file=/usr/etc/r2proto.conf
context=from-zaptel
group=0
callgroup=0
pickupgroup=0
channel => 1-15, 17-31
group=1
callgroup=1
pickupgroup=1
channel => 32-46, 48-62
group=2
callgroup=2
pickupgroup=2
channel => 63-77, 79-93
group=3
callgroup=3
pickupgroup=3
channel => 94-108, 110-124

#include chan_dahdi_additional.conf
#include dahdi-channels.conf