Wireshark-bugs: [Wireshark-bugs] [Bug 3758] M3UA version 5 packet dissecting issue
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=3758
--- Comment #8 from Jack Liu <congliulyc@xxxxxxxxx> 2009-07-20 11:15:32 PDT ---
Hi, Michael,
I have some difficulty in reading this paragraph, part of M3UA V2(not V5):
What should I define the NETWORK_APPEARANCE_LENGTH if I want to write a M3UA v2
dissector?
Thanks.
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2.2.1 Data Message
The Data message contains the SS7 MTP3-User protocol data, which is an
MTP-TRANSFER primitive, including the complete MTP3 Routing Label. The
Data message contains the following parameters:
NETWORK APPEARANCE (Optional)
PROTOCOL DATA
The format for the Data Message parameters is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag (0x1) | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Network Appearance* |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag (0x3) | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Protocol Data |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The optional Network Appearance parameter identifies the SS7 network
context for the message, for the purposes of logically separating the
signaling traffic between the SG and the Application Server Process
over a common SCTP Association. An example is where an SG is logically
partitioned to appear as an element in four different national SS7
networks.
Sidebottom et al [Page 20]
Internet Draft SS7 MTP3-User Adaptation Layer March 2000
In a Data message, the Network Appearance defines the SS7 Point Codes
used, the SS7 Network Indicator value and MTP3/MTP3-User protocol
type/variant/version used within the SS7 network partition. Where an
SG operates in the context of a single SS7 network, or individual SCTP
associations are dedicated to each SS7 network context, or the Network
Indicator in the SIO of the MTP-Transfer primitive is sufficient, the
Network Appearance parameter is not required.
The format is an integer, the values of which are assigned according to
network operator policy. The values used are of local significance
only, coordinated between the SG and ASP.
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