| SIP Code | Cause String | |
| 401 | CALL_REJECTED | |
| 402 | CALL_REJECTED | |
| 403 | CALL_REJECTED | |
| 407 | CALL_REJECTED | |
| 603 | CALL_REJECTED | |
| 404 | UNALLOCATED_NUMBER | |
| 485 | NO_ROUTE_DESTINATION | |
| 604 | NO_ROUTE_DESTINATION | |
| 408 | RECOVERY_ON_TIMER_EXPIRE | |
| 504 | RECOVERY_ON_TIMER_EXPIRE | |
| 410 | NUMBER_CHANGED | |
| 413 | SWITCH_CAUSE_INTERWORKING | |
| 414 | SWITCH_CAUSE_INTERWORKING | |
| 416 | SWITCH_CAUSE_INTERWORKING | |
| 420 | SWITCH_CAUSE_INTERWORKING | |
| 421 | SWITCH_CAUSE_INTERWORKING | |
| 423 | SWITCH_CAUSE_INTERWORKING | |
| 505 | SWITCH_CAUSE_INTERWORKING | |
| 513 | SWITCH_CAUSE_INTERWORKING | |
| 480 | CAUSE_NO_USER_RESPONSE | |
| 400 | NORMAL_TEMPORARY_FAILURE | |
| 481 | NORMAL_TEMPORARY_FAILURE | |
| 500 | NORMAL_TEMPORARY_FAILURE | |
| 503 | NORMAL_TEMPORARY_FAILURE | |
| 486 | USER_BUSY | |
| 600 | USER_BUSY | |
| 484 | INVALID_NUMBER_FORMAT | |
| 488 | INCOMPATIBLE_DESTINATION | |
| 606 | INCOMPATIBLE_DESTINATION | |
| 502 | NETWORK_OUT_OF_ORDER | |
| 405 | SERVICE_UNAVAILABLE | |
| 406 | SERVICE_NOT_IMPLEMENTED | |
| 415 | SERVICE_NOT_IMPLEMENTED | |
| 501 | SERVICE_NOT_IMPLEMENTED | |
| 482 | EXCHANGE_ROUTING_ERROR | |
| 483 | EXCHANGE_ROUTING_ERROR | |
| 487 | ORIGINATOR_CANCEL | |
| Others | NORMAL_UNSPECIFIED |
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