I assume there is a call history beyond the missed calls to show, right?
Not sure if youve already done this, but it might be worth asking on the Grandstream forums or the company to see if there is something that can be done on the phone side.
Look at the cancel message for the call and see what FreePBX/Asterisk is sending, that will help determine if Grandstream can support those messages.
Yes I did mean that it wouldn’t show any calls that the other phone took unless the call was missed and in that case it showed on both.
I may do this, but the issue is different to what I originally thought when I split the phones into two separate extensions and they were one of them was still having issues staying registered, what would happen was the second phone would register then unregister after a minute or so while the Grandstream would report that it was registared.
I seemed to get both working having one on pjsip and the other on sip although this isn’t ideal.