Problem Solved
I noticed that there was a 28th of December update on Volla OS so done the update
After that I wiped the SD card and done a fresh install of Ubuntu Touch 20.04
And it's working fine

Hello
I installed Ubuntu Touch on my Volla 22 phone via the multi boot option on their original android OS
Everything is fine with Ubuntu Touch apart from making or receiving phone calls
I can accept incoming calls or make calls, it connects to the phone number but I or the other person can't hear anything, there is no audio
I can send text messages, use other apps etc
Is this a known issue ?
Any work around ?
Any help would be appreciated
Thanks in advance

Problem Solved
I noticed that there was a 28th of December update on Volla OS so done the update
After that I wiped the SD card and done a fresh install of Ubuntu Touch 20.04
And it's working fine

@sven
Hi it's 20.04
Sorry I should have put that in
It's the image that automatically downloads via the Volla boot manager

Hello
I installed Ubuntu Touch on my Volla 22 phone via the multi boot option on their original android OS
Everything is fine with Ubuntu Touch apart from making or receiving phone calls
I can accept incoming calls or make calls, it connects to the phone number but I or the other person can't hear anything, there is no audio
I can send text messages, use other apps etc
Is this a known issue ?
Any work around ?
Any help would be appreciated
Thanks in advance