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[mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] För Guy Harris
Skickat: den 19 februari 2007 05:19
Till: Developer support list for Wireshark
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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