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Title : No Service To This Number Reject Code
Author(s) : D. Schwartz
Filename : draft-schwartz-sip-nsr-code-00.txt
Pages : 7
Date : 2007-7-5
The Session Initiation Protocol (SIP) allows calls to both addresses
of record (AORs) such as sip:alice@example.com and telephone numbers
with either sip or tel schemes such as tel:+12127771234. As opposed
to the AOR where the domain specifies the exact location or realm of
the user and a reject code provides enough visiblity to the calling
party to exit gracefully (e.g. a 404 indicates that there is no point
in trying further as the requested user either does not exist or is
offline with no voicemail) with telephone numbers (TNs) this is not
the case. With more and more TNs representing actual IP endpoints
there is a need to differentiate in an error code between rejecting a
call due to a misdialed number (i.e. the number does not exist) and a
number that is just not associated with an IP endpoint (for example
in a case where there is no billing relationship and as such the
rejecting proxy cannot forward to a PSTN termination provider. This
specification defines a new SIP response code (No Service Reject -
nsr) for this purpose.
A URL for this Internet-Draft is:
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