SIP to PSTN Cause Code Mapping

 

IP Event

Description

PSTN Cause

 

Code

 

 

 

404

Not found

No route to destination

3

486

User here

User busy

17

480 Temporarily

No user response

18

18

unavailable

 

20

 

 

 

403

Forbidden

Call Rejected

21

410 Gone

Number changed

22

404

Not found

Unallocated number

3

404

Not found

Unallocated number

3

484 Address

Address incomplete

28

incomplete

 

 

501

Not

Service or option not implemented

79

implemented

 

 

404

Not found

Unallocated number

3

503

Service

Service or option unavailable

63

unavailable

 

 

503

Service

Service or option unavailable

63

unavailable

 

 

503

Service

Service or option unavailable

63

unavailable

 

 

503

Service

Service or option unavailable

63

unavailable

 

 

503

Service

Service or option unavailable

63

unavailable

 

 

403

Forbidden

Bearer Capability not authorized

21

403

Forbidden

Service or option not implemented

79

501

Not

Service or option not implemented

79

implemented

 

 

501

Not

Service or option not implemented

79

implemented

 

 

503

Service

Service or option unavailable

63

Unavailable

 

 

400

Bad request

Interworking, unspecified

95

400

Bad request

Interworking, unspecified

95

408

Request

Recovery on Expires timeout

102

timeout

 

 

400

Bad request

Protocol error

111

500

Internal

Any code other than those listed

127

server error

above:

 

VIP-2100 User’s manual

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