Installing to an existing Asterisk system

Hello,
I have a customer that I'm rebuilding their network servers for them. They have an existing asterisk server that provides their current phone system.
What I'd like to know is that if I install FreePBX on their server, would it:
a) overwrite their config files (sip.conf, extensions.conf, etc)
b) be able to read the existing config files
Thanks,
John
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Quote: a) overwrite their
Yes
No
Mikael Carlsson
(I am off-line, tinkering with my Chevy and my radios, don't know when I will be back)
Are you clever??
If the current Asterisk system has something custom you want to keep you can integrate that code via extensions_custom.conf
As for standard PBX features and extensions I would just reload them.
How many phones and what type?