Asterisk 1.2.15 / Zaptel 1.2.13
Customers calling in on the Analogue line reported hearing themselves.
This was completely solved by running fxotune -i 1 / fxotune -s
Since then, the person in the office (Using Aastra 9133i) has complained about hering their own voice echoing but I am not sure how to deal with this.
Any assistance appreciated.