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 Hi!!! I'm writing a plugin for our program's own protocol, which encapsulates a whole 'q931' package  in user-user (look at the end of massage in red ) But I have problem to register own protocol!  I'm missing the dissector_add() in my (sub)dissector
void proto_reg_handoff_mytype(void) {       static gboolean initialized = FALSE;       if (!initialized) {       H323UserInformation_handle= find_dissector("h323ui");       ipnet_handle= create_dissector_handle(dissect_mytype, proto_mytype);       dissector_add("h225.messageContent_item",0xFE,mytype_handle);                  /*0xFE for identifier my protcol */             initialized = TRUE;       }; }; But when wireshark build !! I get the error: ** ERROR:(packet.c:697):???: assertion failed: (sub_dissectors) No.     Time        Source                Destination           Protocol Info     203 15.094231   10.24.30.13           10.24.30.15           Q.931    CS: setup SETUP Frame 203 (210 bytes on wire, 210 bytes captured)     Arrival Time: Jun  2, 2008 17:57:50.481268000     [Time delta from previous captured frame: 0.016456000 seconds]     [Time delta from previous displayed frame: 15.094231000 seconds]     [Time since reference or first frame: 15.094231000 seconds]     Frame Number: 203     Frame Length: 210 bytes     Capture Length: 210 bytes     [Frame is marked: False]     [Protocols in frame: eth:ip:tcp:q931:q931:h225:q931]     [Coloring Rule Name: TCP]     [Coloring Rule String: tcp] Ethernet II, Src: Ericsson_fb:c0:9c (00:01:ec:fb:c0:9c), Dst: Ericsson_52:f2:14 (00:80:37:52:f2:14)     Destination: Ericsson_52:f2:14 (00:80:37:52:f2:14)         Address: Ericsson_52:f2:14 (00:80:37:52:f2:14)         .... ...0 .... .... .... .... = IG bit: Individual address (unicast)         .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)     Source: Ericsson_fb:c0:9c (00:01:ec:fb:c0:9c)         Address: Ericsson_fb:c0:9c (00:01:ec:fb:c0:9c)         .... ...0 .... .... .... .... = IG bit: Individual address (unicast)         .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)     Type: IP (0x0800) Internet Protocol, Src: 10.24.30.13 (10.24.30.13), Dst: 10.24.30.15 (10.24.30.15)     Version: 4     Header length: 20 bytes     Differentiated Services Field: 0xb8 (DSCP 0x2e: Expedited Forwarding; ECN: 0x00)         1011 10.. = Differentiated Services Codepoint: Expedited Forwarding (0x2e)         .... ..0. = ECN-Capable Transport (ECT): 0         .... ...0 = ECN-CE: 0     Total Length: 196     Identification: 0xf0fa (61690)     Flags: 0x00         0... = Reserved bit: Not set         .0.. = Don't fragment: Not set         ..0. = More fragments: Not set     Fragment offset: 0     Time to live: 64     Protocol: TCP (0x06)     Header checksum: 0x3836 [correct]         [Good: True]         [Bad : False]     Source: 10.24.30.13 (10.24.30.13)     Destination: 10.24.30.15 (10.24.30.15) Transmission Control Protocol,      Source port: mxomss (1141)     Destination port: h323hostcall (1720)     Sequence number: 1    (relative sequence number)     [Next sequence number: 157    (relative sequence number)]     Acknowledgement number: 1    (relative ack number)     Header length: 20 bytes     Flags: 0x18 (PSH, ACK)         0... .... = Congestion Window Reduced (CWR): Not set         .0.. .... = ECN-Echo: Not set         ..0. .... = Urgent: Not set         ...1 .... = Acknowledgment: Set         .... 1... = Push: Set         .... .0.. = Reset: Not set         .... ..0. = Syn: Not set         .... ...0 = Fin: Not set     Window size: 5840     Checksum: 0xc1ad [validation disabled]         [Good Checksum: False]         [Bad Checksum: False] TPKT, Version: 3, Length: 156     Version: 3     Reserved: 0     Length: 156 Q.931     Protocol discriminator: Q.931     Call reference value length: 2     Call reference flag: Message sent from originating side     Call reference value: 012A     Message type: SETUP (0x05)     Bearer capability         Information element: Bearer capability         Length: 3         1... .... = Extension indicator: last octet         .00. .... = Coding standard: ITU-T standardized coding (0x00)         ...0 1000 = Information transfer capability: Unrestricted digital information (0x08)         1... .... = Extension indicator: last octet         .00. .... = Transfer mode: Circuit mode (0x00)         ...1 0000 = Information transfer rate: 64 kbit/s (0x10)         1... .... = Extension indicator: last octet         ...0 0101 = User information layer 1 protocol: Recommendation H.221 and H.242 (0x05)     Called party number: '129'         Information element: Called party number         Length: 4         .... 1001 = Numbering plan: Private numbering (0x09)         .100 .... = Number type: Subscriber number (0x04)         1... .... = Extension indicator: last octet         Called party number digits: 129     User-user         Information element: User-user         Length: 133         Protocol discriminator: X.208 and X.209 coded user information H.225.0 CS       H323-UserInformation            h323-uu-pdu                h323-message-body: setup (0)                 setup                     protocolIdentifier: 0.0.8.2250.0.2 (Version 2)                     h245Address: ipAddress (0)                         ipAddress                             ip: 10.24.30.13 (10.24.30.13)                             port: 2002                     sourceInfo                         .... ...0 mc: False                         0... .... undefinedNode: False                     destinationAddress: 1 item                         Item 0                             Item: dialedDigits (0)                                 dialedDigits: 129                     .... 0... activeMC: False                     conferenceID: 00000018-3e17-fb70-0008-467f00b63678                     conferenceGoal: create (0)                         create: NULL                     callType: pointToPoint (0)                         pointToPoint: NULL                     sourceCallSignalAddress: ipAddress (0)                         ipAddress                             ip: 10.24.30.13 (10.24.30.13)                             port: 1720                     callIdentifier                         guid: 00000018-3e17-fb70-0008-467f00b63678                     0... .... mediaWaitForConnect: False                     1... .... canOverlapSend: True             0... .... h245Tunneling: False             tunnelledSignallingMessage                 tunnelledProtocolID                     id: tunnelledProtocolObjectID (0)                         tunnelledProtocolObjectID: 1.3.12.9 (SNMPv2-SMI::org.12.9)                 messageContent: 1 item                     Item 0                         Item: 46 octets                         Q.931                             Protocol discriminator: Q.931                             Call reference value length: 2                             Call reference flag: Message sent from originating side                             Call reference value: 0053                             Message type: SETUP (0x05)                             Bearer capability                                 Information element: Bearer capability                                 Length: 3                                 1... .... = Extension indicator: last octet                                 .00. .... = Coding standard: ITU-T standardized coding (0x00)                                 ...0 0000 = Information transfer capability: Speech (0x00)                                 1... .... = Extension indicator: last octet                                 .00. .... = Transfer mode: Circuit mode (0x00)                                 ...1 0000 = Information transfer rate: 64 kbit/s (0x10)                                 1... .... = Extension indicator: last octet                                 ...0 0011 = User information layer 1 protocol: Recommendation G.711 A-law (0x03)                             Channel identification                                 Information element: Channel identification                                 Length: 3                                 1... .... = Extension indicator: last octet                                 .0.. .... = Interface identifier present: False                                 ..1. .... = Interface type: Primary rate interface                                 .... 1... = Indicated channel is exclusive: Exclusive; only the indicated channel is acceptable                                 .... .0.. = D-channel indicator: False                                 .... ..01 = Information channel selection: Channel indicated in following octets (0x01)                                 1... .... = Extension indicator: last octet                                 .00. .... = Coding standard: ITU-T standardized coding (0x00)                                 ...0 .... = Number/map: Channel indicated by number                                 .... 0011 = Element type: B-channel units (0x03)                                 1... .... = Extension indicator: last octet                                 .000 0010 = Channel number: 2                             Non-locking shift to codeset 5: Information elements for national use                             Unknown information element (0x31)                                 Information element: Unknown (0x31)                                 Length: 1                                 Data: 80                             Called party number: '129'                                 Information element: Called party number                                 Length: 4                                 .... 1001 = Numbering plan: Private numbering (0x09)                                 .100 .... = Number type: Subscriber number (0x04)                                 1... .... = Extension indicator: last octet                                 Called party number digits: 129                             High-layer compatibility                                 Information element: High-layer compatibility                                 Length: 2                                 .00. .... = Coding standard: ITU-T standardized coding (0x00)                                 High layer characteristics identification: Telephony                             User-user                                 Information element: User-user                                 Length: 15                                 Protocol discriminator: User-specific protocol                                 User information: FEB30C07498131323533357F0182 (0xFE is identifier of own protocol) 0000  00 80 37 52 f2 14 00 01 ec fb c0 9c 08 00 45 b8   ..7R..........E. 0010  00 c4 f0 fa 00 00 40 06 38 36 0a 18 1e 0d 0a 18   ......@.86...... 0020  1e  0030  16 d0 c1 ad 00 00 03 00 00 9c 08 02 01 2a 05 04   .............*.. 0040  03 88 90 a5 70 04 c9 31 32 39 7e 00 85 05 20 d0   ....p..129~... . 0050  06 00 08 91 4a 00 02 00 0a 18 1e 0d 07 d2 00 00   ....J........... 0060  01 01 00 45 c0 00 00 00 18 3e 17 fb 70 00 08 46   ...E.....>..p..F 0070   0080  06 b8 11 00 00 00 00 18 3e 17 fb 70 00 08 46  0090  00 b6 36 78 01 00 01 80 10 88 01 00 35 00 03 2b   ..6x........5..+ 00a0  0c 09 01 2e 08 02 00 53 05 04 03 80 90 a3 18 03   .......S........ 00b0  a9 83 82 9d 31 01 80 70 04 c9 31 32 39 7d 02 91   ....1..p..129}.. 00c0  81 7e  00d0  01 82       . 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