My customer has recently started hearing echo intermittenly when calling the PSTN and also when the PSTN calls them. Note the PSTN end no echo is experienced.
There are 8 analog trunks and all of them i have enabled echo cancel coverage 48ms. So far we are monitoring however can someone advise how i can go about troubleshooting this issue. This issue recently occured after a power outage, i am not certain if this had anything to do with issue but i am letting you all know. Additionally the Telco has ruled out that the problem is not them.