I have a potential customer with an LG - model iPECS-300 SYSTEM in Israel. this system support Sip and they would like to purchase a Samsung OS7200 but,
they want to be able to have some kind of intergration between the 2 system, have any body done any TYPE of itergration or some kind of networking with other system.Any help is appreciated

If you can get sip trunking working, you will be able to call between systems, *maybe* over flow calls between systems (though they will be treated as new calls on each system).