We have an FXO card in a 2811 router taking calls from the PSTN and routing them to Call Manager 5.1. Recently users are complaingng that random inbound calls are ringing to the phone as they should but that on some calls both parties can hear what they are describing as "fax machine sounds" when called party picks up. CM user can call them right back with no problems. Never an issue on outbound calls.
Anyone seen this before?
Thanks in advance! All replies rated!