Chan_dongle GSM-VoIP gateway issue

Asterisk Asterisk Hardware
1

I’m trying to set up a GSM-VoIP gateway using a Raspberry Pi and a USB modem, as described here: http://www.raspberry-asterisk.org/documentation/gsm-voip-gateway-with-chan_dongle/

I got the dongle connected, I can send SMS messages from the command line, but I can’t get the SIP-to-dongle transition working.

I have a pjsip extension which I connect to using Linphone. When I try sending an SMS from Linphone, I get these messages in the Asterisk log:

ERROR[1132][C-00000000]: translate.c:1320 ast_translator_best_choice: Cannot determine best translation path since one capability supports no formats
WARNING[1132][C-00000000]: channel.c:6203 ast_request: No translator path exists for channel type dongle (native (slin)) to (none)
WARNING[1132][C-00000000]: app_dial.c:2525 dial_exec_full: Unable to create channel of type 'dongle' (cause 58 - Bearer capability not available)
WARNING[1132][C-00000000]: app_macro.c:310 _macro_exec: No such context 'macro-outisbusy' for macro 'outisbusy'. Was called by XXXXXXXXXX@from-internal
ERROR[1132][C-00000000]: channel.c:5640 set_format: Unable to set format because channel Message/ast_msg_queue supports no formats
ERROR[1132][C-00000000]: channel.c:8131 ast_channel_start_silence_generator: Could not set write format to SLINEAR

And when I try to make a call, I get:

ERROR[1268]: at_response.c:466 at_response_error: [dongle0] Dial failed
ERROR[1268]: at_response.c:471 at_response_error: [dongle0] AT^DDSETEX failed
WARNING[2387][C-00000001]: app_macro.c:310 _macro_exec: No such context 'macro-outisbusy' for macro 'outisbusy'. Was called by +XXXXXXXXXXX@from-internal
WARNING[2387][C-00000001]: channel.c:5005 ast_prod: Prodding channel 'PJSIP/54321-00000000' failed

What am I missing?

2

It looks like you have multiple issues.

You are missing a context for macro-outisbusy but that doesn’t appear to be stopping you from dialing.

It looks like it may be a codec/format issue, I’ve never used a GSM-Voip gateway before, Are you sure you can use ulaw or does it need to use GSM?

3

Thanks for the reply.

It turns out that voice capability was disabled on the dongle. After enabling it, I’m able to make calls, but I only get one-way audio on inbound calls. If you have any suggestions for fixing that, I’d be happy to read them.

The SMS issue remains, but I think it’s because Linphone’s text messaging works only for SIP, not SMS. I probably need to use something else. For instance e-mail, XMPP or the web interface that chan_dongle offers.

4

I hope that helps. Here is my configuration:

—dongle.conf

[gsmgw]
context=gsmgw
imei=765432112345678
imsi=123456876543210

;audio=/dev/ttyUSB1 ; tty port for audio connection; no default value
;data=/dev/ttyUSB2 ; tty port for AT commands; no default value

—extensions.conf

;dial out via gsmgw

exten => _0.,1,Dial(Dongle/gsmgw/${EXTEN})
same => n,Hangup()

;incoming calls

[gsmgw]
; Incoming from GSM/3G GW to deskphone

exten => +98765412325,1,Dial(SIP/deskphone)