Thank you for your reply.

sRTP can't be used by the others as they are 7200s and do not support sRTP.

Could you make me an example how you would "number" the site id's?

By "route table" do you mean to put in just "1" in the modify- field? and / or do you put also something in under 3.1.5?

Coud you test on your end if the case happans also with you that after pressing a button the routing number is shown?