https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6009
Summary: H323 rate multiplier wrong
Product: Wireshark
Version: 1.5.x (Experimental)
Platform: Other
OS/Version: Windows 7
Status: NEW
Severity: Normal
Priority: Low
Component: Wireshark
AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
ReportedBy: johnreg@xxxxxxxxx
Build Information:
Version 1.5.0-SVN-35142 (SVN Rev 35142 from /trunk
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When looking at H323 traces the rate multiplier is incorrect by 128 so if I
place a call at 1920 kbps this should be a rate multiplier of 30 (30 x 64 Kbps)
but in wireshark it is decoded as 158 so and extra 128 is added.
An example is shown here (call rate 1920, rate multiplier should be 30)
...1 1000 = Information transfer rate: Multirate (64 kbit/s base rate) (0x18)
Rate multiplier: 158
Looking at the H225 spec only bits 1-7 should be used for the rate multiplier,
bit 8 is always set to 1.
"Rate multiplier (octet No. 4.1)
– Shall be present if information transfer rate is set to "multirate".
– The extension bit (bit 8) shall be set to "1".
– The bits 1 through 7 shall indicate the bandwidth needed for the call as
defined in the following (note, that in contrast to ITU-T Rec. Q.931, a value
of "0000001" is allowed here)."
Think this is the case in current release as well.
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