"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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