Buenas tardes, les comento rapidamente mi problema, tengo un Freepbx instalado a mano (es decir no use el ISO), con asterisk 11, todo funciona perfecto con troncales SIP y las extensiones, sin embargo las llamadas atravez de la tarjeta FXO no me funcionan, la llamada entra y enseguida escucho el mensaje de Good bye, dejo a contuniacion como tengo los archivos

/etc/dahdi/system.conf


# Autogenerated by /usr/sbin/dahdi_genconf on Fri Apr  6 11:53:35 2018 -- do not hand edit
# Dahdi Configuration File
#
# This file is parsed by the Dahdi Configurator, dahdi_cfg
#
# Span 1: WCTDM/0 "Wildcard TDM800P" (MASTER)
fxsks=1
echocanceller=mg2,1
fxsks=2
echocanceller=mg2,2
fxsks=3
echocanceller=mg2,3
fxsks=4
echocanceller=mg2,4
fxsks=5
echocanceller=mg2,5
fxsks=6
echocanceller=mg2,6
fxsks=7
echocanceller=mg2,7
fxsks=8
echocanceller=mg2,8

# Global data

loadzone        = us
defaultzone     = us

etc/asterisk/chan_dahdi.conf

 
;--------------------------------------------------------------------------------;
; Do NOT edit this file as it is auto-generated by FreePBX. All modifications to ;
; this file must be done via the web gui. There are alternative files to make    ;
; custom modifications, details at: http://freepbx.org/configuration_files       ;
;--------------------------------------------------------------------------------;
;
[general]
context=from-pstn
language=es
[trunkgroups]
; generated by module

; for user additions not provided by module

[channels]
context=from-pstn
language=es
busydetect=yes
busycount=10
usecallerid=yes
callwaiting=yes
usecallingpres=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=no
echotraining=no
immediate=no
faxdetect=no
rxgain=0.0
txgain=0.0

#include dahdi-channels.conf

etc/asterisk/dahdi-channels.conf


; Autogenerated by /usr/sbin/dahdi_genconf on Fri Apr  6 11:53:35 2018 -- do not hand edit
; 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/asterisk/chan_dahdi.conf that will include the global settings
;

; Span 1: WCTDM/0 "Wildcard TDM800P" (MASTER)
;;; line="1 WCTDM/0/0"
signalling=fxs_ks
callerid=asreceived
group=0
context=from-pstn
channel => 1
callerid=
group=
context=default

;;; line="2 WCTDM/0/1"
signalling=fxs_ks
callerid=asreceived
group=0
context=from-pstn
channel => 2
callerid=
group=
context=default

;;; line="3 WCTDM/0/2"
signalling=fxs_ks
callerid=asreceived
group=0
context=from-pstn
channel => 3
callerid=
group=
context=default

;;; line="4 WCTDM/0/3"
signalling=fxs_ks
callerid=asreceived
group=0
context=from-pstn
channel => 4
callerid=
group=
context=default

;;; line="5 WCTDM/0/4"
signalling=fxs_ks
callerid=asreceived
group=0
context=from-pstn
channel => 5
callerid=
group=
context=default

;;; line="6 WCTDM/0/5"
signalling=fxs_ks
callerid=asreceived
group=0
context=from-pstn
channel => 6
callerid=
group=
context=default

;;; line="7 WCTDM/0/6"
signalling=fxs_ks
callerid=asreceived
group=0
context=from-pstn
channel => 7
callerid=
group=
context=default

;;; line="8 WCTDM/0/7"
signalling=fxs_ks
callerid=asreceived
group=0
context=from-pstn
channel => 8
callerid=
group=
context=default

aqui viene la parte curiosa, si entro a asterisk, y escribo dahdi show channels, el resultado es este

 Chan Extension       Context         Language   MOH Interpret        Blocked    State      Description
 pseudo             default               default                         In Service
      1                 default                    default                         In Service
      2                 default                    default                         In Service
      3                 default                    default                         In Service
      4                 default                    default                         In Service
      5                 default                    default                         In Service
      6                 default                    default                         In Service
      7                 default                    default                         In Service
      8                 default                    default                         In Service

De donde toma que el contexto es default ? si yo le puse claramente from-pstn, por mas que le busco no doy con el clavo, algo que se me este pasando? gracias!