hello everyone! i have 5 incoming pstn lines to my pbx. The first one is 8001888 and the others 8001xxx when someone calls at 8001888 the pbx answers the call, if someone calls again at 8001888 the provider forwards the call to another number : 8001xxx. Then the pbx does not answer the call but if someone calls directly at 8001xxx the pbx works fine! What am i doing wrong? i set my zap trunks to maximum channels 1, is this the problem? thanks!