RE: DRN Label Issues - Issue #2

Brian,

I would think we would send with an Error Code of Zero.  I agree with
you that it is the best choice.

Regards,
Lincoln 

-----Original Message-----
From: Brian F. G. Bidulock [mailto:[email protected]] 
Sent: Wednesday, October 11, 2006 3:34 PM
To: Haresign Lincoln
Cc: Barry Nagelberg; [email protected]
Subject: 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/