[android-developers] changing source class of android.jar

Hi,
is it possible to modify class SipProfile from android.net.sip
package? What I only need is to fix one number (P-CSCF default port is
4060). I have found this source
http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/2.3.3_r1/android/net/sip/SipProfile.java?av=f
but how to compile it and download all android 2.3.3 source codes -
class files?
Or another tutorial in editing sources would be very appreciated.
Thanks.

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