Just installed new IP PBX for customer, Grandstream 6202 with GXP2140 phones, when handset is picked up and talking to their customer, they can hear the voice of another employee coming through the phone from another inactive phone. Are there any issues that I should know about, and how to fix this issue?
is it pstn / pots lines ?
Yes, they have 3 pots lines
check the lines - unplug all and enter one at a time till you replicate the issue as it sounds like cross talk on the physical lines causing the issue…