Hi Guy,
Got it, thanks very much for your time and quick response!
Best Regards
Nan Xiao
On Tue, Sep 21, 2021 at 4:54 PM Guy Harris wrote:
>
> On Sep 21, 2021, at 1:17 AM, Nan Xiao wrote:
>
> > I have an original pcap file whose RTP payload type is AMR-WB, and it
> > uses "Octet-Aligned Mode" to encode data. Then I just changed the
> > octet-align from 1 to 0 in SIP/SDP message (The 1st packet, fmtp:123
> > octet-align=0), and hope the wireshark can assume the data as
> > "Bandwidth-Efficient Mode", but the wireshark still decodes the AMR-WB
> > encoding as "Octet-Aligned Mode".
>
> The AMR dissector currently has no mechanism by which it can get an
> indication of whether octet-aligned or bandwidth-efficient mode is used,
> other than by a preference setting for the AMR protocol.
>
> You can work around this in Wireshark by opening up the Preferences dialog,
> opening up the "Protocols" list, going to the "AMR" entry in that list, and
> setting the "Type of AMR encoding of the payload" to "RFC 3267n BW-efficient".
>
> If you want the AMR dissector to get that information from the SIP messages
> used to set up the conversation (if those messages are available!), please
> file an enhancement request at
>
> https://gitlab.com/wireshark/wireshark/-/issues
>
> Attach your capture to the issue.
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