Here I send RTP & SIP capture, everything is ok there, and a LCR log. The strange thing at the log i saw is a problem setting Ext port in a Release state. I also send interface.conf.

LCR log:
000000 TRACE 12.11.13 01:40:54.228 CH(1): MNCC_SETUP_RSP LCR<->BSC  connected type=0 plan=1 present=0 screen=3 number=
000000 DEBUG (in port.cpp/new_state() line 267): PORT(GSM-0-in) new state PORT_STATE_IN_ALERTING --> PORT_STATE_CONNECT_WAITING
000000 DEBUG (in port.cpp/message_epoint() line 617): PORT(GSM-0-in) setting tone '' dir ''
000000 TRACE 12.11.13 01:40:54.359 CH(1): MNCC_SETUP_COMPL_IND LCR<->BSC
000000 DEBUG (in port.cpp/new_state() line 267): PORT(GSM-0-in) new state PORT_STATE_CONNECT_WAITING --> PORT_STATE_CONNECT
000000 DEBUG (in port.cpp/new_state() line 267): PORT(Ext-0-out) new state PORT_STATE_CONNECT --> PORT_STATE_RELEASE
000000 DEBUG (in port.cpp/new_state() line 267): PORT(Ext-0-out) new state PORT_STATE_RELEASE --> PORT_STATE_RELEASE
000000 DEBUG (in remote.cpp/~Premote() line 46): Destroyed Remote process(Ext-0-out).
000000 DEBUG (in port.cpp/~Port() line 215): removing port (2) of type 0x4002, name 'Ext-0-out' interface 'Ext'
000000 DEBUG (in port.cpp/~Port() line 218): Removing us from bridge 1
000000 TRACE 12.11.13 01:40:59.550 EP(2): RELEASE  from CH(2)  cause value=16 location=1-Local-PBX
000000 TRACE 12.11.13 01:40:59.551 EP(1): TONE  to CH(1)  directory default  name cause_10
000000 TRACE 12.11.13 01:40:59.551 EP(1): DISCONNECT  to CH(1)  cause value=16 location=1-Local-PBX
000000 DEBUG (in port.cpp/message_epoint() line 617): PORT(GSM-0-in) setting tone 'cause_10' dir ''
000000 DEBUG (in port.cpp/set_tone() line 367): PORT(GSM-0-in) Given Cause 0x10 has no tone, using release tone
000000 TRACE 12.11.13 01:40:59.551 CH(1): MNCC_DISC_REQ LCR<->BSC  progress coding=3 location=1 descr=8  cause coding=3 location=1 value=16
000000 DEBUG (in port.cpp/new_state() line 267): PORT(GSM-0-in) new state PORT_STATE_CONNECT --> PORT_STATE_OUT_DISCONNECT
000000 DEBUG (in port.cpp/read_audio() line 497): PORT(GSM-0-in) no tone: /opt/lcr/share/lcr/tones_american/release
000000 DEBUG (in port.cpp/read_audio() line 600): PORT(GSM-0-in) opening tone: /opt/lcr/share/lcr/tones_american/release_loop
000000 DEBUG (in port.cpp/read_audio() line 600): PORT(GSM-0-in) opening tone: /opt/lcr/share/lcr/tones_american/release_loop
000000 DEBUG (in port.cpp/read_audio() line 600): PORT(GSM-0-in) opening tone: /opt/lcr/share/lcr/tones_american/release_loop
000000 DEBUG (in port.cpp/read_audio() line 600): PORT(GSM-0-in) opening tone: /opt/lcr/share/lcr/tones_american/release_loop
000000 DEBUG (in port.cpp/read_audio() line 600): PORT(GSM-0-in) opening tone: /opt/lcr/share/lcr/tones_american/release_loop
000000 DEBUG (in port.cpp/read_audio() line 600): PORT(GSM-0-in) opening tone: /opt/lcr/share/lcr/tones_american/release_loop
000000 DEBUG (in port.cpp/read_audio() line 600): PORT(GSM-0-in) opening tone: /opt/lcr/share/lcr/tones_american/release_loop
000000 DEBUG (in port.cpp/read_audio() line 600): PORT(GSM-0-in) opening tone: /opt/lcr/share/lcr/tones_american/release_loop

Interface.conf
# interface.conf
################


[GSM]
gsm-bs
#hr
tones yes
earlyb no

# Use chan_lcr (Asterisk PBX interface) as external interface.
[Ext]
remote asterisk
context from-lcr
extern
earlyb yes
tones no