Hi @sales
It is OK for me with AT&T on HL7648. <;> Only required to set up voice calls. TA remains in command mode
I have attached the log file for your reference. HL7648.txt (998 Bytes)
ATD+8003310500;
OK
AT+CLCC
+CLCC: 1,0,2,0,0,“8003310500”,145
OK