Isup Protocol Error Unspecified
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(*) 17 – user busy 486 Busy here 18 – no user responding 408 Request Timeout 19 isup release cause – no answer from the user 480 Temporarily unavailable 20 – subscriber protocol error unspecified 111 reason absent 480 Temporarily unavailable 21 – call rejected 403 Forbidden (+) 22 – number changed (s/ o diagnostic) 410 normal unspecified Gone 22 – number changed ( w/ diagnostic) 301 Moved permanently 23 – redirection to new destination 410 Gone 26 – non-selected user clearing 404 Not Found (=) 27 –
Cause 127 Interworking Unspecified
destination out of order 502 Bad Gateway 28 – address incomplete 484 Address incomplete 29 – facility rejected 510 Not implemented 31 – normal unspecified 480 Temporarily unavailable Resource unavailable 34 – no circuit available 503 Service unavailable 38 – network out of order 503 Service unavailable 41 – temporary failure 503 Service unavailable 42 – switching equipment congestion 503 normal unspecified what is the problem Service unavailable 47 – resource unavailable 503 Service unavailable Service or option not available 55 – incoming calls barred within CUG 403 Forbidden 57 – bearer capability not authorized 403 Forbidden 58 – bearer capability not presently available 503 Service unavailable 65 – bearer capability not implemented 488 Not Acceptable here 70 – Only restricted digital information bearer capability is available (National use) 488 Not Acceptable here 79 – service or option not implemented 501 Not implemented Invalid message 87 – user not member of CUG 403 Forbidden 88 – incompatible destination 503 Service unavailable 102 – Call Setup Time-out Failure 504 Gateway timeout 111 – Protocol Error Unspecified 500 Server internal error Interworking 127 – Internal Error - interworking unspecified 500 Server internal error 500 – Server internal error (default) (*) ISDN Cause 16 will usually result in a BYE or CANCEL (+) If the cause location is ‘user’ than the 6xx code could be given rather than the 4xx code. the cause value received
to SIP Code Table The following table describes the mappings implemented by FreeSwitch (see mod_sofia.c:hangup_cause_to_sip). Unspecified causes codes (no value in isdn disconnect cause codes the "SIP Equiv." column in the table) are translated to SIP
Q.850 Cause Codes
"480 Temporarily Unavailable" by FreeSwitch. The table also contains non-standard codes above 127 (ISUP and ISDN only
Q.850 Cause=127 Text= Interworking Unspecified
specify codes up to 127). These codes are used internally to FreeSwitch to indicate other states. (These codes do not map directly to SIP error codes either.) The http://www.dialogic.com/webhelp/img1010/10.5.1/webhelp/General_Reference/def_sip-ss7_cc.htm complete list of SWITCH_CAUSE_ codes (switch_call_cause_t) is defined in include/switch_types.h. See ITU-T Q.850 standard for a formal definition of standard telephony disconnect cause codes for ISDN, and the mapping between Q.931 (DSSS1) and ISUP codes. See ITU Q.1912.5 for a formal definition of interoperability between ISUP and SIP, especially section 6.11 which specifies the "Reason" header and https://wiki.freeswitch.org/wiki/Hangup_Causes gives the mapping of the disconnect cause codes between ISUP and SIP. Another set of mappings are the Q.SIG / SIP mappings from RFC 4497 section 8.4.1. (Q.SIG is one of many extensions to Q.931 used for PBX-to-PBX signalling on private links.) In practice it appears that FreeSwitch implements neither Q.1912.5 nor RFC4497. ITU-T Q.850 Code SIP Equiv. Enumeration Cause Description 0 UNSPECIFIED Unspecified. No other cause codes applicable. This is usually given by the router when none of the other codes apply. This cause usually occurs in the same type of situations as cause 1, cause 88, and cause 100. 1 404 UNALLOCATED_NUMBER Unallocated (unassigned) number [Q.850 value 1] This cause indicates that the called party cannot be reached because, although the called party number is in a valid format, it is not currently allocated (assigned). 2 404 NO_ROUTE_TRANSIT_NET No route to specified transit network (national use) [Q.850] This cause indicates that the equipment sending this cause has received a request to route the call throu
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