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Bug #2370

OsmoBTS accepts SAPI!=0 for LAPDm contention resolution

Added by laforge 9 days ago.

Status:
New
Priority:
Low
Assignee:
-
Category:
-
Target version:
-
Start date:
07/17/2017
Due date:
% Done:

0%

Spec Reference:

Description

When the MS is sending the first SABM to the network, it must use SAPI=0, see 44.006 8.4.1.4 "According to sub-clause 9, the contention resolution procedure is only permitted with SAPI value 0." Howeer, OsmoBTS (or rather the libosmocore lapdm/lapd code) perform it also with other SAPI,s such as SAPI=3.

Found while working on http://git.osmocom.org/osmo-ttcn3-hacks/tree/lapd/L1CTL_Test.ttcn

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