Echo could be consistently reproduced with topology above. When PhoneA from PSTN during business hours makes a call to PhoneB but no one answers, the call is sent to Auto Attendant(AA). The PhoneA makes selections with Auto Attendant. If the selection is sent the call back to PhoneC or PhoneB and someone picks up the call. The Phone C or B will hear echo.
Direct calls to Phone B from PSTN could not reproduce echo.
Direct calls to and from PhoneD may occasionally reproduce echo.
If 3825A is removed as below, then all echoes are gone.
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