On Windows 8, every few calls I get this error while dialing a call and then the call fails. Does anyone know what to do to fix this?

[INFO] mod_dptools.c:3084 Originate Failed.  Cause: NORMAL_CLEARING

2013-03-28 15:54:25.545988 [NOTICE] mod_dptools.c:3204 Hangup sofia/internal/10001@192.168.1.2 [CS_EXECUTE] [NORMAL_CLEARING]

2013-03-28 15:54:25.565992 [NOTICE] switch_core_session.c:1536 Session 18 (sofia/internal/10001@192.168.1.148) Ended

2013-03-28 15:54:25.565992 [NOTICE] switch_core_session.c:1540 Close Channel sofia/internal/10001@192.168.1.148 [CS_DESTROY]