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author | Neels Hofmeyr <neels@hofmeyr.de> | 2017-07-04 23:08:44 +0200 |
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committer | Neels Hofmeyr <neels@hofmeyr.de> | 2017-08-27 03:52:43 +0200 |
commit | 218e4b4aa0fc6de842ff820dec8e97d1f083268a (patch) | |
tree | 268a6e509270b1c80a36dd1a526da41a9b01a8e0 /doc/call-routing.txt | |
parent | 5ea6bfce56d6ae7be6d85e05b5e4eaebc94d1005 (diff) |
move openbsc/* to repos root
This is the first step in creating this repository from the legacy openbsc.git.
Like all other Osmocom repositories, keep the autoconf and automake files in
the repository root. openbsc.git has been the sole exception, which ends now.
Change-Id: I9c6f2a448d9cb1cc088cf1cf6918b69d7e69b4e7
Diffstat (limited to 'doc/call-routing.txt')
-rw-r--r-- | doc/call-routing.txt | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/doc/call-routing.txt b/doc/call-routing.txt new file mode 100644 index 000000000..3402f9e33 --- /dev/null +++ b/doc/call-routing.txt @@ -0,0 +1,25 @@ +Call routing in OpenBSC + +Flow of events: + + # MO call initiated by MS, CHANNEL RQD, IMMEDIATE ASSIGN + # MS sends CC SETUP message, we assume already on TCH/H FACCH + # OpenBSC does a subscriber lookup based on the target extension + * If a subscriber is found: + # send CALL PROCEEDING message to MO + # page the MT subscriber and ask itI to ask for TCH/H + # once paging completes, we have the TCH/H for the MT end + # send SETUP to MT + # receive CALL CONFIRMED from MT + # set-up the TRAU mux mapping between the E1 subslots for both TCH/H + # receive ALERTING from MT, route ALERTING to MO + # receive CONNECT from MT, confirm to MT with CONNECT_ACK + # send a CONNECT message to MO, receive CONNECT_ACK from MO + * If subscriber is not found: + # send RELEASE COMPLETE with apropriate cause to MO (1: unalloacated 3: no route) + + + +Thoughts about RR/MM: + +* we allocate RR/MM entities on demand, when we need them |