iaxclient code hacked by Tipic

Today we have released the iaxclient code modified by Tipic Inc. Please note that this is an *unofficial* version of this library, so if you find some error or you wants some information about it, please don't ask to official iaxclient maintainer Steve Kahn, but concatc us.
We and Steve will do our best to harmonize our works and put all our patches into official tree.