I have noticed that the RC7620-1 (R8 and R9 Firmware) does not return CONNECT when dialling outgoing voice calls but there seems to be a workaround:
RC7620 with EE SIM forced to 2G network, diallng out to my O2 phone on 4G network
ATD; returns OK
When I answer my phone the RC7620 does not respond with CONNECT but the call is active as I hear audio.
If I then press a DTMF key on my phone, the RC7620 responds with CONNECT on receipt of the tone.
Alternatively if I send an “AT” command from the RC7620 it responds with CONNECT. Therefore my workaround is to dial, wait for OK and then send continuous AT commands to stimulate a CONNECT.
Similar it does not detect remote-end hanging up unless I do the above too.
If RC7620-1 is on 4G then the CONNECT response is received as soon as the call is answered, no workaround is required.
Is this is bug in the firmware?