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| author | Oliver Smith <osmith@sysmocom.de> | 2019-02-01 16:01:55 +0100 |
|---|---|---|
| committer | Oliver Smith <osmith@sysmocom.de> | 2019-02-01 16:05:12 +0100 |
| commit | 68bbdc5f02d891133123573c422202f61923ebdf (patch) | |
| tree | 44595be86fbe19e2ffb76aaf98f580d5c48a2ce5 | |
| parent | 2bca846fab0412ccc74d9cb0328d3f374fd71933 (diff) | |
GSUP: message category indicated by last two bits
Make this part of the specification, so we can simplify libosmocore
code by knowing that error message is (request message | 0x000001).
Related: I46d9f2327791978710e2f90b4d28a3761d723d8f (libosmocore)
Change-Id: Iec1b4ce4b7d8eb157406f006e1c4241e8fba2cd6
| -rw-r--r-- | common/chapters/gsup.adoc | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/common/chapters/gsup.adoc b/common/chapters/gsup.adoc index 673ed59..7a16e64 100644 --- a/common/chapters/gsup.adoc +++ b/common/chapters/gsup.adoc @@ -766,6 +766,19 @@ Direction: EIR (via HLR) => VLR |0x32|CHECK-IMEI Result |=== +The category of the message is indicated by the last two bits of the type. +Request, Error and Result messages only differ in these last two bits, so it is +trivial to transform them. + +[options="header",cols="20%,80%"] +|=== +|Ending Bits|Message Category +|00|Request +|01|Error +|10|Result +|11|Other +|=== + [[gsup-ie-ipaddr]] ==== IP Address |