Query Regarding RPM spec file

Hello Experts,

I am dealing with RPM spec file as shown below, could you please explain me  what exactly the 'umask 022'  command does during the installation and uninstall ?? to which directory it sets those permission and spec file also has 'chmod 777 /opt/cps/platform/sips' command. what is the order of precedence.

#=Begin Preamble=================================================
# (C) platformyright 2008 cps Systems, Inc.
#   Name : opensips.spec
#   Description :cps Repackaged opensips 1.8
#   03/23/2012   cps   Initial Version , David
#=End Preamble===================================================

Group: DevBase
License: None
Name: cps-opensips
Version: %PRODUCT_VERSION
Release: 1
Summary: cps repackaged opensips package.
Vendor: cps Systems, Inc

provides: cps-opensips
#requires: linux base only

%description
Repackaged OpenSips as the SIP Server Proxy providor for Voipserver.
This package is intended to provide sips for platform  

%files
%attr(0500, root,root) /opt/cps/platform/sips/install_sips.sh
%attr(0666, root,root) /opt/cps/platform/sips/*

%pre
umask 022
echo "Inside %pre section"
if [ "$1" = "1" ];
then
	mkdir -p  /opt/cps/platform/sips
	chmod 777 /opt/cps/platform/sips
fi

%post
umask 022
echo "Inside %post section"
if [ "$1" = "1" ];
then
        echo "--- Installing cps-opensips as sips package --- "
        cd /opt/cps/platform/sips/
        /bin/bash ./install_sips.sh
        RC=$?
        [ "$RC" == "0" ] || echo "ERROR:Sips Installer exit code $RC"
        [ "$RC" == "0" ] || exit 1
fi
exit 0

%postun
echo "Inside %postun section"

%preun
echo "Inside %preun section"