I have 2 Magix already network together and trying to add a 3rd location. Have set the udp for 21 for site 1, 22 for site 2, 23 for site 2 to site 3 and site 3 is 24. I get a busy when I call from site 3 to 2 and vice versa. My udp table is programmed for 890 pool and FRL of 0. Can't get site 2 and 3 working.