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Service or option not available:

This kind of cause value indicates a permanent situation

ISUP Cause value SIP response
---------------- ------------
55 incoming calls barred within CUG 403 Forbidden
57 bearer capability not authorized 403 Forbidden
58 bearer capability not presently 503
available

Service unavailable:

Service or option not implemented

ISUP Cause value SIP response
---------------- ------------
65 bearer capability not implemented 501 Not implemented
79 service or option not implemented 501 Not implemented

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Posted by sagitraz

ISUP Cause value SIP response
---------------- ------------
55 incoming calls barred within CUG 403 Forbidden
57 bearer capability not authorized 403 Forbidden
58 bearer capability not presently 503 Service unavailable
available
65 bearer capability not implemented 488 Not Acceptable Here
70 only restricted digital avail 488 Not Acceptable Here
79 service or option not implemented 501 Not implemented

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Posted by karthi_456