Wireshark · Ethereal-users: [Ethereal-users] M3UA Decoding Error

[Sig Tran <sigtran7@xxxxxxxx>]

I'm using Ethereal to display an M3UA capture session. I've found a very weird thing analyzing a M3UA packet If I use "RFC 3332" version to decode the packet everything is correct, but if I use any "Internet Draft" version I get a lot "Unknown Parameters". We did not find any difference in Payload Data Message (DATA) parameters between those version.

 

You can see what I mean in the attached files.

 

Thank you.
 

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No.     Time        Source                Destination           Origen UDP Destino UDP Protocol Info
     52 17.999104   localhost.localdomain localhost.localdomain 2905       2907        ISUP (ITU) IAM (CIC 1) 

Frame 52 (118 bytes on wire, 118 bytes captured)
Ethernet II, Src: 00:00:00:00:00:00, Dst: 00:00:00:00:00:00
Internet Protocol, Src Addr: localhost.localdomain (127.0.0.1), Dst Addr: localhost.localdomain (127.0.0.1)
User Datagram Protocol, Src Port: 2905 (2905), Dst Port: 2907 (2907)
MTP 3 User Adaptation Layer
    Version: Release 1 (1)
    Reserved: 0x00
    Message class: Transfer messages (1)
    Message type: Payload data (DATA) (1)
    Message length: 76
    Network appearance (28036591)
        Parameter Tag: Network appearance (512)
        Parameter length: 8
        Network appearance: 28036591
    Routing context (1 context)
        Parameter Tag: Routing context (6)
        Parameter length: 8
        Routing context: 287454020
    Protocol data (SS7 message of 28 bytes)
        Parameter Tag: Protocol data (528)
        Parameter length: 44
        OPC: 65793
        DPC: 66308
        SI: ISUP (5)
        NI: 0
        MP: 4
        SLS: 6
    Correlation identifier (4242281112)
        Parameter Tag: Correlation identifier (19)
        Parameter length: 8
        Correlation Identifier: 4242281112
ISDN User Part
    CIC: 1
    Message type: Initial address (1)
    Nature of Connection Indicators: 0x0
    Forward Call Indicators: 0x2200
    Calling Party's category: 0xa (ordinary calling subscriber)
    Transmission medium requirement: 0 (speech)
    Called Party Number: 910025775
    Pointer to start of optional part: 9
    Calling Party Number: 915555052
    End of optional parameters (0)

No.     Time        Source                Destination           Origen UDP Destino UDP Protocol Info
     52 17.999104   localhost.localdomain localhost.localdomain 2905       2907        M3UA (ID 07) DATA 

Frame 52 (118 bytes on wire, 118 bytes captured)
Ethernet II, Src: 00:00:00:00:00:00, Dst: 00:00:00:00:00:00
Internet Protocol, Src Addr: localhost.localdomain (127.0.0.1), Dst Addr: localhost.localdomain (127.0.0.1)
User Datagram Protocol, Src Port: 2905 (2905), Dst Port: 2907 (2907)
MTP 3 User Adaptation Layer
    Version: Release 1 (1)
    Reserved: 0x00
    Message class: Transfer messages (1)
    Message type: Payload data (DATA) (1)
    Message length: 76
    Unknown parameter (tag 512 and 4 bytes value)
        Parameter Tag: Unknown (512)
        Parameter length: 8
        Parameter value: 01ABCDEF
    Routing context (1 context)
        Parameter Tag: Routing context (6)
        Parameter length: 8
        Routing context: 287454020
    Unknown parameter (tag 528 and 40 bytes value)
        Parameter Tag: Unknown (528)
        Parameter length: 44
        Parameter value: 0001010100010304050004060100010022000A0002090783...
    Unknown parameter (tag 19 and 4 bytes value)
        Parameter Tag: Unknown (19)
        Parameter length: 8
        Parameter value: FCDC1298