asterisk users - Aug 2007 - Cisco 7970G App Development?

Do you know where I can find docs for developing apps that run locally
on a Cisco 7970G IP phone (with SIP firmware installed)? Apps that use
the phone's display, keys, and other local functions, as well as call
init/control, and other network features, including looking up directory
info in, say, an LDAP server? All development using Asterisk instead of
CallManager services, of course.
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(C) Matthew Rubenstein