[asterisk-users] Connecting a GSM gateway to a FXO port

[Hans Feringa]

I am trying to get a GSM gateway (Alpha Tech GSM Gateway Blue Gate Dual
Band Analoog FXO) working with Asterisk.
I had a working FXO configuration to a analog port of a small home 1/4
ISDN pbx.
I used this same configuration to connect a GSM Gateway that is supposed to
be connected to the external(FXO) analog port of a pbx.

I can get my configuration to dial the mobile number via the gateway, but
Asterisk never detects that the remote side (the mobile phone) answered.

When I use the r Dial option it will continue to signal a ringing tone to
the local extension. When I leave out the r, I do get a connection but
only for the duration of the configured number of seconds the Dial command
is waiting for a connection. Because it did not detect the call being
connected it will stop with a NOANSWER status effectively dropping the
connection.

I want to try two possible solutions:
1) I try to find out how to configure the GSM gateway behave in such a way
that Asterisk correctly detects the call being connected.
2) I configure Asterisk to work with this device.

The problem is that I looked thru the configuration options of the gateway
and I could not find anything that made sense to me in relation to this
prb.

What (how) is the gateway supposed to signal back that the call is
connected? If I know what is needed I can go back to my supplier with the
right questions.

If the gateway can not be configured properly, I want to know how I could
configure Asterisk to work around this problem and make it work anyway.

This is the zapata.conf for the FXO port:
[channels]
; hardware channels
; default
usecallerid=yes
hidecallerid=no
callwaiting=no
threewaycalling=yes
transfer=yes
echocancel=yes
echotraining=yes
immediate=no
flash=100
hanguponpolarityswitch=yes
callprogress=yes
progzone=nl

busydetect=yes
busycount=4

language=nl
; define channels
context=binnenkomend
signalling=fxs_ks
channel => 1 ; pstn attached to port 1

This is the Dialplan fragment:

exten => _87.,1,Wait(0.5)
exten => _87.,n,Dial(Zap/1/${EXTEN:2},30,rtT)
exten => _87.,n,Macro(fastbusy)
exten => _87.,n,Hangup
exten => _87.,102,Playback(tt-allbusy)

[macro-fastbusy]
exten => s,1,Answer
exten => s,n,Wait,1
exten => s,n,Playback(vm-isunavail)
exten => s,n,Wait(3)
exten => s,n,Hangup



    -- Executing [870623027714 at home:1] Wait("SIP/kimura1-08236550", "0.5")
in new stack
    -- Executing [870623027714 at home:2] Dial("SIP/kimura1-08236550",
"Zap/1/0623027714|30|rtT") in new stack
    -- Called 1/0623027714
    -- Nobody picked up in 30000 ms
    -- Hungup 'Zap/1-1'
    -- Executing [870623027714 at home:3] Macro("SIP/kimura1-08236550",
"fastbusy") in new stack
    -- Executing [s at macro-fastbusy:1] Answer("SIP/kimura1-08236550", "")
in new stack
    -- Executing [s at macro-fastbusy:2] Wait("SIP/kimura1-08236550", "1") in
new stack
    -- Executing [s at macro-fastbusy:3] Playback("SIP/kimura1-08236550",
"vm-isunavail") in new stack
    -- <SIP/kimura1-08236550> Playing 'vm-isunavail' (language 'nl')
    -- Executing [s at macro-fastbusy:4] Wait("SIP/kimura1-08236550", "3") in
new stack
    -- Executing [s at macro-fastbusy:5] Hangup("SIP/kimura1-08236550", "")
in new stack
  == Spawn extension (macro-fastbusy, s, 5) exited non-zero on
'SIP/kimura1-08236550' in macro 'fastbusy'
  == Spawn extension (macro-fastbusy, s, 5) exited non-zero on
'SIP/kimura1-08236550'

Any help would be appreciated.

Hans Feringa