handsfree profile questions

I am now trying to implement a handsfree Audio Gateway on a mobile
phone, hit one problem:
what is the usage model for memory dialing, I cannot find a reference
phone and the the specification itself is not clear either. I guess
the I need to setup a memory pool that contains phoneNumbers, like:
char memory[maxNumber][maxPhoneNumberLen];
The phone should provide GUI for the user to set this memory[][]. And
when HFAG receives a request for memory dialing, HFAG will dial the
phoneNumber directly, am I right in understanding this part?