Unknown SCTP Payload Protocol Id (SABP)

Hi!

I am using wire shark version 1.4.6 and when i send encoded SABP (Service Area Broadcast Protocol) packet (WRITE REPLACE message) over SCTP (Stream Control Transmission Protocol) the SCTP Payload protocol identifier is Unknown (31).

However i found two links where SABP is defined as PPI=31 and it's used over SCTP.

1. http://wiki.wireshark.org/SABP
2. http://anonsvn.wireshark.org/wireshark/trunk/epan/dissectors/packet-sctp.c

Could some one please help me on this or have a SCTP trace whith SABP message?

Thanks.

Stream Control Transmission Protocol, Src Port: 3452 (3452), Dst Port: 3452 (3452)
Source port: 3452
Destination port: 3452
Verification tag: 0x1500d017
Checksum: 0x745fed2a (not verified)
DATA chunk(unordered, complete segment, TSN: 476389665, SID: 0, SSN: 0, PPID: 31, payload length: 49 bytes)
    Chunk type: DATA (0)
        0... .... = Bit: Stop processing of the packet
        .0.. .... = Bit: Do not report
    Chunk flags: 0x07
        .... ...1 = E-Bit: Last segment
        .... ..1. = B-Bit: First segment
        .... .1.. = U-Bit: Unordered delivery
        .... 0... = I-Bit: Possibly delay SACK
    Chunk length: 65
    TSN: 476389665
    Stream Identifier: 0x0000
    Stream sequence number: 0
    Payload protocol identifier: Unknown (31)
    Chunk padding: 000000
Data (49 bytes)
0000  00 00 00 2d 00 00 06 00 07 40 02 53 75 00 0f 40   ...-.....@.Su..@
0010  09 00 00 03 e6 79 d1 3f f7 64 00 0d 40 02 0a 63   .....y.?.d..@..c
0020  00 09 40 02 18 d8 00 04 40 01 39 00 00 40 02 11   ..@.....@.9..@..
0030  c4                                                .
Data: 0000002d000006000740025375000f4009000003e679d13f...
[Length: 49]