salo0920, I know what you mean, I just have not noticed, I guess its because on the systems that I have this app. Both sides have their own lines (PRI-DID) and the target line rings and appears on the sets, so external calls ring in on the target line button and internal calls ring in on the intercom because they are set up as ring only (each set is set up with 2 target lines 1-External DID[over public PRI] 2-Internal DN [over private SL-1 PRI].
On Aug.1st I have to install 4 sytems together and each location is almost maxed out (80-120sets), so I will not be able to give them 2 target lines each...so I am trying to figure out the digit pattern for each site and make shore that there are no conflicts and that the Internal and External Rec'd digits match so that they only require 1 targ. line.