This log say when begin the problem:
17:04:18 IVM Answering Attendant Exit
17:05:29 SIP Private IP is: 192.168.164.46:5070
17:05:29 SIP Public IP is: 192.168.164.46:5070
17:05:29 The modem "Minipuerto WAN (L2TP)" was detected but cannot be used because it is not a 100% TAPI compliant voice modem.
17:05:49 Attempting to register sip:700@192.168.164.8
17:05:50 Registered as: sip:700@192.168.164.8
17:05:52 IVM Answering Attendant Run
17:05:53 Date: 2009-07-01
17:05:53 IVM Answering Attendant Engine Started
18:48:54 Making outbound call to 2011682 on line validador
18:48:54 Initiated sip call to: 2011682
18:48:55 Error. Other side said: Not Found
18:48:55 Call has disconnected
18:48:55 Outbound call 2011682 not answered
18:48:55 Call disconnected
18:48:59 Making outbound call to 2011685 on line validador
18:48:59 Initiated sip call to: 2011685
18:49:00 Error. Other side said: Not Found
18:49:00 Call has disconnected
18:49:00 Outbound call 2011685 not answered
18:49:00 Call disconnected
18:49:04 Making outbound call to 2011717 on line validador
18:49:04 Initiated sip call to: 2011717
18:49:05 Error. Other side said: Not Found
18:49:05 Call has disconnected
18:49:05 Outbound call 2011717 not answered
18:49:05 Call disconnected
18:49:09 Making outbound call to 2011732 on line validador