I've been experiencing this strange issue for some time and so far I've not been able to find the fix for it. Hoping someone can help !!!
I am running CCM 4.1.3 with 7940 and 7960 phones, The issue I've been experiencing is that when I talk on speaker over an FXO line to an outside call. I notice this screeching/crackling noise when I talk. It only happens when I am speaker and it seems to get worse when I talk louder. This has been an ongoing issue and it happens at all locations where I have analog lines with FXO card.
Has anyone run into this issue before ? I appreciate any inputs / suggestions.
Thanks in advance !!!