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Bug #3059
closedSystem Information on SACCH missing L2 Pseudo-Length
Start date:
03/11/2018
Due date:
% Done:
100%
Resolution:
Spec Reference:
Description
Something seems odd about our SI5/SI6 messages.
The message on the downlink SACCH is structured as follows:
- two octets L1 header
- two octets "LAPDm B4" frame format: Address + Control Octet
- 23-4=19 octets of L3 payload (as specified in TS 44.018), consisting of
- one octet L2 pseudo-length
- 18 octets of actual L3 message
It appears that the messages that we send from the Osmocom stack are missing the L2 pseudo-length. This maybe related to https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=14105
Checklist
- wireshark patch for RSL
- wireshark patch for SACCH/LAPDm
- patch for legacy openbsc.git
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