We have been experiencing cross talking since we have upgraded our CCM to version: 188.8.131.5200-4 two months ago. I know cross talking has probably nothing to do with the CCM but I just try to give you some detail about the latest changes. It only happens when we call outside through PSTN. I opened a ticket with the Carrier but they say there's nothing wrong in their end. The cross talking is only one way. We can hear them but they can't hear us. Please correct me if I am wrong but accroding to me, cross talking is always a physical layer problem. Am I mistaken?
Here're what I have done in order to resolve the issue but no such a luck so far.
1) Two weeks ago a unpluged and pluged back the cable which connects the GW to the Carrier (PSTN). It helped for two days and the issue came back again.
2) I thought maybe the cable is faulty and changed it and again the problem went away for 3 days and came back again.
3) Lastly, I rebooted the gateway and we were good for a week or two but unfortunately it came back again yesterday. I don't know what else I can do. Has anyone experienced such a problem? If so, what have you done to get rid of it?
GW Version 12.4(13r)T