DRN Label Issues - Issue #2

Lincoln,

RFC 3868 says:

4.7.3.2.  SCCP Connection Oriented traffic

   ...  If an ASP is not available, the SG discards the message.

SCCP does not discard connection-oriented messages, it sends an
ERR message with an Error Cause: particularly when the messae is
an Inativity Test message.  Discarding an Inactivity Test message
will break the SCCP protocol.

The choices for error cause from Q.713 (07/96) Section 3.14 are:

   0 0 0 0 0 0 0 0  Local Reference Number (LRN) mismatch - unassigned
                    destination LRN
   0 0 0 0 0 0 0 1  Local Reference Number (LRN) mismatch - inconsistent
                    source LRN
   0 0 0 0 0 0 1 0  pointcode mismatch
   0 0 0 0 0 0 1 1  service class mismatch
   0 0 0 0 0 1 0 0  unqualified
   0 0 0 0 0 1 0 1  |
          to        |  spare
   1 1 1 1 1 1 1 1  |

The first one looks like a good choice; however, is an very bad idea
to go telling an SG what it is supposed to do with SS7 messages.  It
is the responsibility of the SG to maintain a correctly functioning
SS7 protocol towards the SS7 network.

Do you thing the message should be discarded?

--brian

-- 
Brian F. G. Bidulock
[email protected]
http://www.openss7.org/