BICC make call fails

Hi,

I use Host license bicc, m3ua. I make call almost successfull. But sometimes I face this error on all channels when make call out going

GCEV_DISCONNECTED
gc_ResultInfo() successfully called
a_Info->gcValue = 0x506
a_Info->gcMsg = Event caused by call control library specific failure
a_Info->ccLibId = 5
a_Info->ccLibName = GC_SS7_LIB
a_Info->ccValue = 0x2c
a_Info->ccMsg = No description available
a_Info->additionalInfo =

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or

GCEV_DISCONNECTED
gc_ResultInfo() successfully called
a_Info->gcValue = 0x547
a_Info->gcMsg = Congestion on the line
a_Info->ccLibId = 5
a_Info->ccLibName = GC_SS7_LIB
a_Info->ccValue = 0x2a
a_Info->ccMsg = No description available
a_Info->additionalInfo =

�

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Are there any idea?