Ok i got the point i think Michael has provided the main idea which i should follow. I will work on this and after that come back here and discuss my issues,

also

Waqar listen ,
Please don't spoil my discussions and try to understand iam going through the same phase of life as you are..looking for help and guidelines on coding and pratically implementing it...after going through your posts ...i realize that you depressedly want to design PBX system...i hope in future i may be able to help you...