Hi, I have 4 PSTN lines hooked up to my Patton SN 4114. When I make outgoing calls I have terrible echo that I can't get rid of. I have the echo canceler turned on under the PSTN profile but it's not doing anything. I opened a ticket with Patton and they said to adjust the input/output gain to eliminate the issue. When I do that the volume is too low for people on the other side of the conversation. Any ideas? Anything my local telco can do on their end? Thanks!