BLF SIP Notify Problem when offline extension

Do grandstream have any intention of fixing the SIP notify problem with extensions that are offline with the latest Trixbox? The reason has already been found and it's to do with a state string change within asterisk from "terminated" to "confirmed"

Asterisk seem to have no intention of changing it back to "terminated", although according to the SIP Notify RFC "terminated" seems to be valid so surely all Grandstream need to do in their firmware is to check for both terminated or confirmed to keep backwards compatibility with asterisk 1.2.

Thanks