UCM6208 this year of FW (unsure of what version but mostly updated). Same for the GXP.
Spent a good 2 -3 hours researching this subject here on the forums.
Already have enabled x1001 to Allow Auto Answer by Call-Info/Alert-Info in the phone GUI itself.
From a different extension that initiates an intercom to x1001, I get 2 results:
1.) Using the BLF for x1001 from a different phone, the call rings at x1001
2.) If I manually dial *801001, it then auto-answers on speakerphone at x1001.
I really do not want to tell the customer to manually dial *80 + ExtensionNumber when I know they will wonder why have a button labeled x1001 already?
The purpose of this is to just simply have a direct hands free intercom discussion between 2 phones. So not using paging group or intercom group.