sending AT commands to M10 with shield through GSM library

Official Hardware Retired GSM Shield
1

I am tinkering with the Original M10 Arduino GSM shield and hit a problem with the loop inside of the .voiceCall() method.
I described the problem in another thread (that i put into the wrong section, im afraid): GSM Shield how to interrupt voiceCall() - Networking, Protocols, and Devices - Arduino Forum

As a nice british user pointed out to me there i could solve my problem through using the ATH command.
But for the complexity of the SMS services and so on I'd also like to still stick with the library to talk to the shield.

Is it possible to send AT commands while using the GSM library with the shield?

My attempts with SoftwareSerial of course failed for the GSM lib uses the same pins. Is there maybe a way to talk to the M10 through the lib?

2

I probably found it in the source code of the GSM lib:

theGSM3ShieldV1ModemCore.print()

only question left now would be how to change the voiceCallStatus so that the monitoring parts of library do not get completly confused.