Wireshark · Wireshark-dev: Re: [Wireshark-dev] H.223 dissector - separate "bitswapping" into separate dissector

["Anders Broman" <a.broman@xxxxxxxxx>]

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[mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] För Guy Harris
Skickat: den 19 februari 2007 05:19
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Ämne: Re: [Wireshark-dev] H.223 dissector - separate "bitswapping" into
separate dissector

Richard van der Hoff wrote:

> Well, if your H.223 is over TCP, it may or may not be bitswapped

Guy wrote:
>That presumably means that either
>
>	1) call setup negotiates the bit order
>
>or
>
>	2) the bit order is chosen "out of band" (e.g., manually).
>
>If it's negotiated at call setup time, presumably if the call setup 
>traffic is present, Wireshark can determine the bit order, so this 
>presumably would be needed only in the case where the call setup traffic 
>*isn't* present, so you would have to manually specify that the TCP 
>connection is carrying H.223 traffic.¨

For H.223 over TDM I know there has been trouble on agreeing what the proper
Bit order is between manufacturers so at least some implementations
determine the bit order heuristically...

Anders
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