[Asterisk-Users] Giving sip users multiple contexts

[Matt]

How would I go about giving sip users multiple contexts?  For instance
right now I have them all in: from-sip-internal

Is there a way I can (for sip users) also include say my [dial-911]
[dial-local] and [dial-longdistance].. bearing in mind that I want to
have different sips allowed to do different things so I can't just do
includes for those in my from-sip-internal.