Problem with multiple incomming call trought phone lines

this is my configuration:
3 PSTN lines, 3 spa3102, 3 phones (10, 20, 30) extension numbers, each line has time conditions, and IVR that plays a recording, and finally rings one extension.

sometimes when someone call to line 1 , then the call are welcomed by a recorded announce and directed to extention 10, then another call comes from line 2, and in the extention 10 , we listen the recorded anounce while talking with the person on line 1. After that the calls from line 1 and line 2 are mixed I dont know why.

if you need a configfile let me know wich one.

here is the logfile


Check your PSTN wiring, it sounds like a “split pair”