asterisk users - May 2006 - Access to sip.conf username field from dialplan

I have two SIP clients defined in sip.conf, as follows:

    [dave]
    username=dave
    type=friend
    secret=dave
    host=dynamic
    context=local
    accountcode=deskoptional

    [dave-laptop]
    username=dave
    type=friend
    secret=dave
    host=dynamic
    context=local
    accountcode=deskoptional

I want to refer to the username field in extensions.conf, but cannot find a
function to do it.  I know Asterisk can see this value, because both "SIP
SHOW PEER dave" and "SIP SHOW PEER dave-laptop" display the
desired value under "Def. Username".

PS: I am new to Asterisk and this newsgroup, so a cc to my email address (nntp
at deskoptional.com) would be appreciated.

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