Hello - We will be setting up 9 locations with 1 main 8710 and 8500's and Modular Messaging at all locations. We would like to use site number like 21, 22, 23 etc, this would menan we have 6 digit dial. Our DID ranges are all over the place. By using a site idenfier this would elminate the need to ensure we do not have duplicate DID at other locations, is this correct? Where on the Avaya forms do you assign the site ID number? Maybe I'm way off base here, but I beleive this is something that can be done? Any suggestions. Thanks! Site Id XX then XXXX 4 digit extesnion. By using a site ID number do you loose a number in dialing plan?