USSD not working/crashing asterisk #43

VasylSamoilov · 2023-01-16T19:31:06Z

VasylSamoilov
Jan 16, 2023

I'm using Quectel EG25. Everything seems to work fine expect for USSD.
If I try to send USSD from asterisk CLI, it errors out
[quectel0] USSD queued for send
-- [quectel0] Error sending USSD 0x7f5c001aa0
[Jan 16 21:02:40] ERROR[46643]: at_response.c:410 log_cmd_response_error: [quectel0] Error sending USSD 0x7f5c001aa0

The reason for that that in plain-text USSD can't be requested in UCS2 encoding, which is the default for chan_quectel, only with GSM

AT+CUSD=1,*111#,15
ERROR
AT+CSCS?
+CSCS: "UCS2"

there are two options:

switch to GSM enconding
If I switch to AT+CSCS="GSM" asterisk-cli USSD command no longer errors out, but crashes asterisk
Send requests in UCS2 encoding (which is not possible from asterisk cli)
AT+CUSD=1,"00230031003000300023", which again works fine, but crashes asterisk on reply

Output of async USSD commands is redirected to /dev/ttyUSB3 by default, which is modem port
This can be changed by telling quectel to switch output to AT port:
AT+QURCCFG="urcport","usbat"

If I do this, asterisk receive a response and crash on ussd reply due toasterisk.service: Main process exited, code=killed, status=11/SEGV
I would be happy to debug more to get USSD working.

Answered by IchthysMaranatha

Jan 19, 2023

In your example, are you not passing diff commands with gsm and ucs2? With ucs2, you seem to passing # 100 #
Anyway, I've added a fix using gsm, it changes encoding to gsm, passes ussd and then reverts to ucs2. Please check with this branch and let me know
https://github.com/IchthysMaranatha/asterisk-chan-quectel/tree/USSDTest
I've added a log here to see the command that is passed on to the modem, you can comment it out if the code works

asterisk-chan-quectel/at_command.c

Line 379 in 95b384e

ast_log (LOG_ERROR, "USSD command passed is %s\n", at_cmd.data);

View full answer

IchthysMaranatha · 2023-01-17T06:09:53Z

IchthysMaranatha
Jan 17, 2023
Maintainer

I'm not able to check this as ussd commands are not working for me with minicom either with gsm encoding. Are they working for your provider in minicom? If yes, you could try commenting out this line

asterisk-chan-quectel/at_command.c

Line 136 in b3534ea

static const char cmd21[] = "AT+CSCS=\"UCS2\"\r";

Recompile, restart modem and check.

6 replies

IchthysMaranatha Jan 17, 2023
Maintainer

First, something should work without Asterisk to correctly test, unless calls and sms work without Asterisk, they will not work with it either. Same with ussd. Unload Asterisk module and test with minicom first on same AT port. If it works, then one can proceed to fix it in Asterisk.

IchthysMaranatha Jan 17, 2023
Maintainer

And have you tested with the change I suggested?

VasylSamoilov Jan 17, 2023
Author

Test with terminal:

+CPIN: READY
ATI
Quectel
EG25
Revision: EG25GGBR07A08M2G
AT+QURCCFG="urcport","usbat"
OK
AT+CSCS="GSM"
OK
AT+CUSD=1,*160#,15
OK

+CUSD: 0,"041A0438045704320441044C043A043804390020044704300441003A002000310034003A00300033003A00330030002000310037002F00300031002F0032003000320033",72
AT+CSCS="UCS2"
OK
AT+CUSD=1,*160#,15
ERROR
AT+CUSD=1,*160#
ERROR
AT+CUSD=1,"002A0031003600300023"
OK

+CUSD: 0,"041A0438045704320441044C043A043804390020044704300441003A002000310034003A00300035003A00330037002000310037002F00300031002F0032003000320033",72

IchthysMaranatha Jan 17, 2023
Maintainer

Ok, it's working with your provider. Please make the change I suggested and build. Disconnect from terminal, restart modem, load changed module and check with Asterisk cli.

VasylSamoilov Jan 17, 2023
Author

I have made a change to static const char cmd21[] = "AT+CSCS="GSM"\r";
Otherwise it's hard to know that the setting value is - undefined behavior.
Now command works, but asterisk crashes on response processing.

pi4*CLI> quectel ussd quectel0 *160#
[quectel0] USSD queued for send
-- [quectel0] Successfully sent USSD 0x7f88001b20
[Jan 17 15:38:28] NOTICE[1324]: at_response.c:347 at_response_ok: [quectel0] Successfully sent USSD 0x7f88001b20
pi4*CLI>
Disconnected from Asterisk server

I'll try to find out how to collect debug trace

IchthysMaranatha · 2023-01-17T14:02:01Z

IchthysMaranatha
Jan 17, 2023
Maintainer

May be a parsing issue I think. I can't check myself, as ussd does not work for me at all. Have you checked with another 2g/3g modem and chan_dongle? Do you get same response in terminal with 2g/3g modem?

5 replies

VasylSamoilov Jan 17, 2023
Author

I don't have much of a variety of modems to test with, just quectel.
Here is debug log, I'm still thinking how to get gdb trace.

[Jan 17 16:29:16] DEBUG[1849]: at_response.c:202 at_response_ok: [quectel0] AT sent successfully
[Jan 17 16:29:16] DEBUG[1849]: at_queue.c:218 at_queue_remove_cmd: [quectel0] remove command 'AT' expected response 'OK' real 'OK' cmd 1/1 flags 0x03 from queue
[Jan 17 16:29:16] DEBUG[1849]: at_queue.c:67 at_queue_remove: [quectel0] remove task with 1 command(s) begin with 'AT' expected response 'OK' from queue
[Jan 17 16:29:18] DEBUG[1716]: res_pjsip_registrar.c:1377 check_expiration_thread: Woke up at 1673965758 Interval: 30
[Jan 17 16:29:18] DEBUG[1716]: res_pjsip_registrar.c:1384 check_expiration_thread: Expiring 0 contacts
[Jan 17 16:29:26] DEBUG[1849]: at_queue.c:124 at_queue_add: [quectel0] insert task with 1 commands begin with 'AT' expected response 'OK' after head of queue
[Jan 17 16:29:26] DEBUG[1849]: at_queue.c:245 at_queue_run: [quectel0] write command 'AT' expected response 'OK' length 3
[72B blob data]
[Jan 17 16:29:26] DEBUG[1849]: at_read.c:79 at_read: [quectel0] receive 6 byte, used 6, free 2042, read 0, write 6
[Jan 17 16:29:26] DEBUG[1849]: at_read.c:94 at_read: [quectel0] [
OK
]
[Jan 17 16:29:26] DEBUG[1849]: at_response.c:202 at_response_ok: [quectel0] AT sent successfully
[Jan 17 16:29:26] DEBUG[1849]: at_queue.c:218 at_queue_remove_cmd: [quectel0] remove command 'AT' expected response 'OK' real 'OK' cmd 1/1 flags 0x03 from queue
[Jan 17 16:29:26] DEBUG[1849]: at_queue.c:67 at_queue_remove: [quectel0] remove task with 1 command(s) begin with 'AT' expected response 'OK' from queue
[Jan 17 16:29:29] DEBUG[1832]: at_queue.c:124 at_queue_add: [quectel0] insert task with 1 commands begin with 'AT+CUSD' expected response 'OK' at tail of queue
[Jan 17 16:29:29] DEBUG[1832]: at_queue.c:245 at_queue_run: [quectel0] write command 'AT+CUSD' expected response 'OK' length 26
[95B blob data]
[Jan 17 16:29:29] DEBUG[1849]: at_read.c:79 at_read: [quectel0] receive 6 byte, used 6, free 2042, read 0, write 6
[Jan 17 16:29:29] DEBUG[1849]: at_read.c:94 at_read: [quectel0] [
OK
]
[Jan 17 16:29:29] NOTICE[1849]: at_response.c:347 at_response_ok: [quectel0] Successfully sent USSD 0x7f60074e30
[Jan 17 16:29:29] DEBUG[1849]: at_queue.c:218 at_queue_remove_cmd: [quectel0] remove command 'AT+CUSD' expected response 'OK' real 'OK' cmd 1/1 flags 0x00 from queue
[Jan 17 16:29:29] DEBUG[1849]: at_queue.c:67 at_queue_remove: [quectel0] remove task with 1 command(s) begin with 'AT+CUSD' expected response 'OK' from queue
[Jan 17 16:29:30] DEBUG[1849]: at_read.c:79 at_read: [quectel0] receive 31 byte, used 31, free 2017, read 0, write 31
[Jan 17 16:29:30] DEBUG[1849]: at_read.c:94 at_read: [quectel0] [
+CREG: 1,"6A20","1FC3967",2
]
[Jan 17 16:29:30] DEBUG[1849]: at_queue.c:124 at_queue_add: [quectel0] insert task with 1 commands begin with 'AT+COPS?' expected response 'OK' at tail of queue
[Jan 17 16:29:30] DEBUG[1849]: at_queue.c:245 at_queue_run: [quectel0] write command 'AT+COPS?' expected response 'OK' length 9
[78B blob data]
[Jan 17 16:29:30] DEBUG[1849]: at_read.c:79 at_read: [quectel0] receive 45 byte, used 45, free 2003, read 0, write 45
[Jan 17 16:29:30] DEBUG[1849]: at_read.c:94 at_read: [quectel0] [
+COPS: 0,0,"UA-KYIVSTAR KYIVSTAR",2

OK
]
[Jan 17 16:29:30] DEBUG[1849]: at_response.c:351 at_response_ok: [quectel0] Provider query successfully
[Jan 17 16:29:30] DEBUG[1849]: at_queue.c:218 at_queue_remove_cmd: [quectel0] remove command 'AT+COPS?' expected response 'OK' real 'OK' cmd 1/1 flags 0x01 from queue
[Jan 17 16:29:30] DEBUG[1849]: at_queue.c:67 at_queue_remove: [quectel0] remove task with 1 command(s) begin with 'AT+COPS?' expected response 'OK' from queue
[Jan 17 16:29:31] DEBUG[1849]: at_read.c:79 at_read: [quectel0] receive 9 byte, used 9, free 2039, read 0, write 9
asterisk.service: Main process exited, code=killed, status=11/SEGV
asterisk.service: Failed with result 'signal'.
asterisk.service: Consumed 18.220s CPU time.
asterisk.service: Scheduled restart job, restart counter is at 1.

IchthysMaranatha Jan 17, 2023
Maintainer

One would have to place debug or log statements all through the ussd sending, receiving and parsing segments of code to identify exactly where in the code block it crashes. My suspicion is that it might be in the parsing and processing of received ussd.

VasylSamoilov Jan 17, 2023
Author

Sure. It was crashing near

asterisk-chan-quectel/at_read.c

Line 82 in b3534ea

iovcnt = rb_read_all_iov (rb, iov);

after adding some debugging and sleep(1) here

asterisk-chan-quectel/ringbuffer.c

Line 52 in b3534ea

{

it stopped crashing and let me debug more.

good news - ussd recieve works and encoding for at command payload should be UCS2, but encoding here is wrong:

asterisk-chan-quectel/at_command.c

Line 333 in b3534ea

EXPORT_DEF int at_enqueue_ussd(struct cpvt *cpvt, const char *code)

it doesn't match plain text as for GSM USSD, and doesn't match UCS2 hexified. So it actually never produces correct CUSD request.
I am not good at C to fix it.

When I send user command asterisk -vvvvvvvrx 'quectel cmd quectel0 AT+CUSD=1,"002A0031003600300023",15' it executes and decodes ussd responce correctly. Great success.

So, two problems

Wrong encoding of ussd code in at_enqueue_ussd
Crash in rb_read_all_iov unless there is a sleep in it

VasylSamoilov Jan 17, 2023
Author

Correction: Crash occurs due to ERROR response, nothing to do with sleep(). Somehow GSM7 encoded USSD code produces a OK reply from quectel that crashes afterwards in rb_read_all_iov on subsequent error. When supplied with proper UCS2 USSD code for AT+CUSD command it works just fine. Current workaround to invoke USSD from cli will be something like asterisk -vrx 'quectel cmd quectel0 AT+CUSD=1,"002A0031003600300023",15'

IchthysMaranatha Jan 18, 2023
Maintainer

Good, you have done well. I'll look into the code and see if I find a fix for ussd ucs2 encoding with His help.

IchthysMaranatha · 2023-01-19T05:00:09Z

IchthysMaranatha
Jan 19, 2023
Maintainer

In your example, are you not passing diff commands with gsm and ucs2? With ucs2, you seem to passing # 100 #
Anyway, I've added a fix using gsm, it changes encoding to gsm, passes ussd and then reverts to ucs2. Please check with this branch and let me know
https://github.com/IchthysMaranatha/asterisk-chan-quectel/tree/USSDTest
I've added a log here to see the command that is passed on to the modem, you can comment it out if the code works

asterisk-chan-quectel/at_command.c

Line 379 in 95b384e

ast_log (LOG_ERROR, "USSD command passed is %s\n", at_cmd.data);

7 replies

IchthysMaranatha Jan 19, 2023
Maintainer

Look at your opening post where you've used
AT+CUSD=1,*111#,15
AT+CUSD=1,"00230031003000300023"

VasylSamoilov Jan 19, 2023
Author

I stand corrected, it works.
[Jan 19 14:27:30] NOTICE[3806]: at_command.c:379 at_enqueue_ussd: USSD command passed is AT+CSCS="GSM";+CUSD=1,"*160#",15;+CSCS="UCS2"
[Jan 19 14:27:30] DEBUG[3806]: at_queue.c:124 at_queue_add: [quectel0] insert task with 1 commands begin with 'AT+CUSD' expected response 'OK' at tail of queue
[Jan 19 14:27:30] DEBUG[3806]: at_queue.c:245 at_queue_run: [quectel0] write command 'AT+CUSD' expected response 'OK' length 46
]Jan 19 14:27:30] DEBUG[3806]: at_queue.c:191 at_write: [quectel0] [AT+CSCS="GSM";+CUSD=1,"*160#",15;+CSCS="UCS2"
[Jan 19 14:27:30] DEBUG[3807]: at_read.c:79 at_read: [quectel0] receive 6 byte, used 6, free 2042, read 0, write 6
[Jan 19 14:27:30] DEBUG[3807]: at_read.c:94 at_read: [quectel0] [
OK
]
-- [quectel0] Successfully sent USSD 0x7f60001a20

[Jan 19 14:27:33] DEBUG[3807]: at_read.c:79 at_read: [quectel0] receive 154 byte, used 154, free 1894, read 0, write 154
[Jan 19 14:27:33] DEBUG[3807]: at_read.c:94 at_read: [quectel0] [
+CUSD: 0,"041A0438045704320441044C043A043804390020044704300441003A002000310034003A00320037003A00330032002000310039002F00300031002F0032003000320033",72
]
[quectel0] USSD DCS=2 (0: gsm7, 1: ascii, 2: ucs2)
[quectel0] Got USSD type 0 'USSD Notify': 'Київський час: 14:27:32 19/01/2023'
[Jan 19 14:27:33] DEBUG[3807]: stasis.c:580 stasis_topic_create_with_detail: Creating topic. name: channel:1674131253.0, detail:

VasylSamoilov Jan 19, 2023
Author

Example that that you are referencing is my mistake due to incorrect copy/paste, I'm sorry.
Correct example would be 002A0031003600300023 for UCS2 and *160# GSM mode.
In order to maintain coherency it would be good to encode USSD number in UCS2, in that case encoding switch will not be required.
But it works anyway. Thank you.

IchthysMaranatha Jan 19, 2023
Maintainer

You're welcome

VasylSamoilov Jan 19, 2023
Author

This will cover 90% of USSD use cases.
From standards standpoint USSD implementation is not quite correct. This is just a note for anyone may be interested in re-implementing it in the future.
First of all, USSD should block all other operations on device from the time request is received until reply or error is reported back. There cannot be two ongoing USSDs in parallel.
Next, there is such thing as interactive USSD which implies user inputs after reply where a number or string should be entered to make a selection, effectively they are USSD menus (which are pretty much an equivalent to voice menus), but they are rare.

RoEdAl · 2023-06-16T08:13:35Z

RoEdAl
Jun 16, 2023

My fork of chan_quectel now sends an receives UCS-2-encoded USSD strings without additional AT+CSCS commands.

0 replies

hello-22-world · 2024-10-19T16:01:15Z

hello-22-world
Oct 19, 2024

I'm still encountering the same USSD issue in the new release. The error message "Error sending USSD 0x74e268004820" appears, and then Asterisk hangs, preventing calls and functionality.

Could you please provide guidance on how to resolve this issue?

[quectel0] USSD queued for send
-- [quectel0] Error sending USSD 0x74e268004820
[Oct 20 00:06:43] ERROR[3079]: at_response.c:410 log_cmd_response_error: [quectel0] Error sending USSD 0x74e268004820

0 replies

IchthysMaranatha · 2024-10-19T16:31:39Z

IchthysMaranatha
Oct 19, 2024
Maintainer

Are you using code from this branch? https://github.com/IchthysMaranatha/asterisk-chan-quectel/tree/USSDTest

9 replies

hello-22-world Oct 26, 2024

The USSD data/string returned by the carrier is causing Asterisk to hang and restart.
(The quectel2 dongle experiences a hang problem, while other dongles produce a garbled output of characters)
When it doesn't hang, I'm only seeing a jumbled mess of code with lots of "¥Δå@Ψ" symbols.
Is there any way to resolve this issue?

it is not work to decode the BASE64_DECODE code:
exten => ussd,1,Verbose(Incoming USSD: ${BASE64_DECODE(${USSD_BASE64})})
exten => ussd,n,System(echo '${STRFTIME(${EPOCH},,%Y-%m-%d %H:%M:%S)} - ${QUECTELNAME}: ${BASE64_DECODE(${USSD_BASE64})}' >> /var/log/asterisk/ussd.txt)
exten => ussd,n,Hangup()

Asterisk*CLI> quectel cmd quectel2 AT+CUSD=1,"00230031003000300023",15
Disconnected from Asterisk server
Asterisk cleanly ending (0).
Executing last minute cleanups

IchthysMaranatha Oct 27, 2024
Maintainer

Again, are you using ussd branch or main branch?

hello-22-world Oct 27, 2024

Again, are you using ussd branch or main branch?

i am using the ussd branch now

IchthysMaranatha Oct 27, 2024
Maintainer

What do logs show?

hello-22-world Oct 27, 2024

What do logs show?

-- Executing [ussd@incoming-mobile:1] Verbose("Local/ussd@incoming-mobile-00000002;1", "Incoming USSD: @(£¡ù Σ@n@,.....

and it will hang randomly on one of the dongle :

Asterisk*CLI> quectel ussd quectel2 *111#
[quectel2] USSD queued for send
[Oct 27 11:11:34] NOTICE[6172]: at_command.c:379 at_enqueue_ussd: USSD command passed is AT+CSCS="GSM";+CUSD=1,"111#",15;+CSCS="UCS2"
-- [quectel2] Successfully sent USSD 0x7988b0001c00
[Oct 27 11:11:34] NOTICE[6168]: at_response.c:347 at_response_ok: [quectel2] Successfully sent USSD 0x7988b0001c00
AsteriskCLI>
Disconnected from Asterisk server
Asterisk cleanly ending (0).
Executing last minute cleanups

IchthysMaranatha · 2024-10-27T04:16:33Z

IchthysMaranatha
Oct 27, 2024
Maintainer

As my operator does not support ussd, no way for me to test USSD myself

Unload asterisk, use minicom to connect to modem and then run
AT+CSCS="GSM";+CUSD=1,"111#",15;+CSCS="UCS2"
What do you get in response?

15 replies

IchthysMaranatha Oct 27, 2024
Maintainer

I'm not really a developer myself, just tinker around to get things working. Anyway, this portion of code completely restricted to uusd alone so it would not cause any other issues and if your ussd is working fine, then great! Well done.

hello-22-world Nov 1, 2024

I apologize for the issue. Asterisk is still crashing after sending the USSD code, and the kernel is reporting the following error:

kernel: asterisk[9145]: segfault at 8 ip 0000764ca4aa1892 sp 0000764c9d87aaa0 error 4 in chan_quectel.so[764ca4a9b000+26000] likely on CPU 0 (core 0, socket 0)

Could you please advise on how to debug this issue?

IchthysMaranatha Nov 2, 2024
Maintainer

Ok, first try this, switch back to original ussdtest branch code without any modifications and insert these lines after

asterisk-chan-quectel/at_response.c

Line 1704 in 2802574

    
           ast_verb (1, "[%s] USSD DCS=%d (0: gsm7, 1: ascii, 2: ucs2)\n", PVT_ID(pvt), dcs);

ast_log (LOG_ERROR, "dcs obtained is %d\n", dcs);
ast_log (LOG_ERROR, "cusd string obtained is %s\n", cusd);
dcs=2;

If it crashes, show me the log and we'll try and find the cause with further changes in code

hello-22-world Dec 6, 2024

Ok, first try this, switch back to original ussdtest branch code without any modifications and insert these lines after

asterisk-chan-quectel/at_response.c

Line 1704 in 2802574

ast_verb (1, "[%s] USSD DCS=%d (0: gsm7, 1: ascii, 2: ucs2)\n", PVT_ID(pvt), dcs);
ast_log (LOG_ERROR, "dcs obtained is %d\n", dcs);
ast_log (LOG_ERROR, "cusd string obtained is %s\n", cusd);
dcs=2;
If it crashes, show me the log and we'll try and find the cause with further changes in code

While monitoring, the issue appears to be caused by server or network problems (high server load or weak signal).
After the message "at_response.c:2159 at_response: [quectel0] Got Response for user's command: 'OK'".
The Asterisk system crashes if no response is received (About 30s) .
How can I increase the response timeout, or allow the process to continue even without a response?
Thank you for your assistance.

IchthysMaranatha Dec 6, 2024
Maintainer

Ah then, you should be resolving those issues rather than tinkering with this code. I haven't looked at it deeply but change required as you desire may not even be in this code but in one of the C libraries used.

IchthysMaranatha · 2024-10-27T04:17:46Z

IchthysMaranatha
Oct 27, 2024
Maintainer

Also, have you tried this fork created by someone else
https://github.com/RoEdAl/asterisk-chan-quectel

1 reply

hello-22-world Oct 27, 2024

Also, have you tried this fork created by someone else https://github.com/RoEdAl/asterisk-chan-quectel

I tested this fork today and was able to get the correct USSD response, but I'm encountering an error when trying to receive SMS messages.

USSD not working/crashing asterisk #43

Replies: 8 comments · 43 replies

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