[ronnie sahlberg <ronniesahlberg@xxxxxxxxx>]

"something unknown here" means that ethereal encountered a construct
in the bitstream it did not recognize.
Due to the way PER works this cause ethereal to stop decoding anything
further in the bitstream of the PDU.

This could be due to many different reasons:
1, bug in the ethereal dissector (not unlikely since it was handwritten)
2, due to ethereal only supporting partial v9 dissection of the
protocol and not v10
3, something else

If you can provide an example capture with the problem and also (if
you have access to) the decode output in text format from a different
tool that does decode the packet correctly, then I would be happy to
look into it and fix the problem in ethereal.
I will not have time to look at it for another week and a half though
since i am travelling and have no access to my development platform.



----- Original Message -----
From: Keith A French 
Date: Sat, 14 Aug 2004 15:27:29 +0100
Subject: [Ethereal-users] H225 Decode Problem
To: Ethereal-Users <ethereal-users@xxxxxxxxxxxx>


With Ethereal V0.10.6 and other recent versions, when I load an H225 &
RTP trace, parts of the decode to not seem to be understood. For
instance whenever an H.225 Call Setup packet occurs, the summary
window shows:-
 
"H.225.0  CS: setup OpenLogicalChannel [UNKNOWN PER: Unrecognized
H.450.x operation][Unreassembled Packet]"
 
In the Protocol Tree window the unreassembled packet is to do with H.4501:-
 
"            h4501SupplementaryService
                Item 0
                    H.450.1
                        SupplementaryService
                            NetworkFacilityExtension
                                EntityType
                                    EntityType: endpoint (0)
                                EntityType
                                    EntityType: anyEntity (1)
                            InterpretationApdu
                                InterpretationApdu:
discardAnyUnrecognizedInvokePdu (0)
                            ServiceApdus
                                ServiceApdus: rosApdus (0)
                                    rosApdus
                                        Item 0
                                            ROS
                                                ROS: invoke (1)
                                                    Invoke
                                                        invokeId: 1
                                                        Opcode
                                                            opcode: global (1)
                                                               
global: 1.2.826.0.1.1907195.1
                                                        something
unknown here [Unrecognized H.450.x operation]
[Unreassembled Packet: H4501]"
 
 
The same problem exists with all other H.225 packets (e.g. Call
proceeding, Alerting, Connect & Release Complete etc). Please can
anyone help with this?
 
 
 

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