Hello, I'm using 4 PSTN lines connected to a Grandstream GXW-4104 and I have some Grandstream BT-201 as extensions connected to the 3CX. When people call to those PSTN lines, there's a delay during the conversation. All those equipments are connected via local network, so I think there should be minimal delay, when actually there's a delay of 1 second or so, much higher than extension to extension calls, when one extension is remote. Any tips on this? Thank you.