[Asterisk-Users] realtime sip confusion

[snacktime]

Trying to use realtime sip for the first time, and it's not working as
expected.
I have one user entry in the sip database.  Everthing else is still in
sip.conf.  When I get an incoming call, this is the database query:

SELECT * FROM ast_home_sip_realtime WHERE name = '+18003859169'

The 800# is the caller id of the caller, which doesnt' make any sense to me.

Is there any documentation about how realtime sip/iax actually work
beyond just the schema's that are on the wiki?

Chris