Quectel EG25-G fails to make GSM and VoLTE calls

Technical Subjects
1

Hey, I am trying to make call using Quectel EG25-G, unfortunaley it says “No carrier”. I have good signal strength and good antenna, but unable to make calls.

version|m-center v.02.08.00
[15:37:23.672] tx: AT
[15:37:23.688] rx:
[15:37:23.688] rx: OK
[15:37:23.703] rx:
[15:38:37.781] tx: ATDxxxxxxxxxx
[15:38:39.588] rx:
[15:38:39.588] rx: NO
[15:38:39.604] rx: CARRIER
[15:38:39.642] rx:

[15:38:48.733] tx: at+cops=0,2,“26202”,0
[15:38:48.802] rx:
[15:38:48.802] rx: OK
[15:38:57.131] tx: at+cereg?
[15:38:57.162] rx:
[15:38:57.162] rx: +CE
[15:38:57.200] rx: REG: 0,4
[15:38:57.200] rx:
[15:38:57.200] rx: OK
[15:39:06.969] tx: AT+QCFG=“ims”,1
[15:39:07.037] rx:
[15:39:07.037] rx: OK
[15:39:15.199] tx: AT+QCFG=“ims”
[15:39:15.230] rx:
[15:39:15.268] rx:
+QCFG: “ims”,1,0
[15:39:15.284] rx:
[15:39:15.284] rx: OK
[15:39:25.534] tx: ATDxxxxxxxxx
[15:39:28.427] rx:
[15:39:28.427] rx: NO
[15:39:28.443] rx: CARRIER
[15:39:28.462] rx:

2

What do these AT commands return?

AT+CGDCONT?
AT+CGPADDR
AT$QCPDPCFGE?
3

Hey, i tried and these are the results.

[11:17:51.341] AT+CGDCONT?
[11:17:51.373]
[11:17:51.373]
[11:17:51.388] +CGDCONT: 1,“IP”,“devapn.gdsp”,“0.0.0.0”,0,0,0,0
[11:17:51.478] +CGDCONT: 2,“IPV4V6”,“ims”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0
[11:17:51.642] +CGDCONT: 3,“IPV4V6”,“”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,1
[11:17:51.757]
[11:17:51.757] OK
[11:18:13.738]
[11:18:13.738] AT+CGPADDR
[11:18:13.770]
[11:18:13.770]
[11:18:13.770] +CGPADDR: 1,“0.0.0.0”
[11:18:13.830] +CGPADDR: 2,“0.0.0.0,0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”
[11:18:13.939]
[11:18:13.939] +CGPADDR: 3,“0.0.0.0,0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”
[11:18:14.039] OK
[11:18:37.830]
[11:18:37.830] AT+QCPDPCFGE?
[11:18:37.861]
[11:18:37.861]
[11:18:37.883]
[11:18:37.883] ERROR
[11:18:58.286]
[11:18:58.286] AT$QCPDPCFGE?
[11:18:58.355]
[11:18:58.355]
[11:18:58.355] $QCPDPCFGE: 1,0,0,0,255,20,300,0,0,0,0,0
[11:18:58.410] $QCPDPCFGE: 2,0,0,0,255,20,300,0,0,0,0,0
[11:18:58.502] $QCPDPCFGE: 3,0,0,0,255,20,300,0,1,0,0,0
[11:18:58.587]
[11:18:58.587]
[11:18:58.587] OK

4

You’ve got APNs configured for data (context 1) and for IMS (context 2). So far so good.

However, you don’t have IP addresses negotiated for either.

Your +CEREG: result is 4 (unknown), rather than the expected 1 (registered, home network) or 5 (registered and roaming).

Do you have signal?

I gave you the wrong AT command there. If you can’t get VoLTE working after you get an address for IMS, please report the result of the AT command: AT$QCPDPIMSCFGE?

5

Hey,
Thank you very much for your reply. I have been investigating the issue and got to know that the issue was with the sim card, which is a gdsp vodafone simcard. The ims service was not attaching to the sim or the sim does not support ims services. I changed the sim card and now i am able to make calls.