Change in osmo-bsc[master]: lchan_fsm: Improve timeout logging line in state WAIT_RLL_RTP_ESTABLISH

pespin gerrit-no-reply at
Thu Jul 8 10:56:44 UTC 2021

pespin has uploaded this change for review. ( )

Change subject: lchan_fsm: Improve timeout logging line in state WAIT_RLL_RTP_ESTABLISH

lchan_fsm: Improve timeout logging line in state WAIT_RLL_RTP_ESTABLISH

This allows quickly finding out whether the timeout is happening due to
RLL not established or whether RTP is not ready. In essence, it
indicates whether issue may be coming from MGW or from MS/BTS side.

If coming from MGW, the timer T3101 is in general not a problem and the
issue should be related to some misbehaving.
If coming from MS/BTS, T3101 may require tunning (it could be a
misbehaving of the MS/BTS too, or simply bad signal).

Related: SYS#5526
Change-Id: Ib655f71aec584962c70d84a4405d996505dff53c
M src/osmo-bsc/lchan_fsm.c
1 file changed, 8 insertions(+), 1 deletion(-)

  git pull ssh:// refs/changes/90/24890/1

diff --git a/src/osmo-bsc/lchan_fsm.c b/src/osmo-bsc/lchan_fsm.c
index 6350481..5a6d27c 100644
--- a/src/osmo-bsc/lchan_fsm.c
+++ b/src/osmo-bsc/lchan_fsm.c
@@ -1704,7 +1704,14 @@
 		lchan->release.in_error = true;
 		lchan->release.rsl_error_cause = RSL_ERR_INTERWORKING;
 		lchan->release.rr_cause = bsc_gsm48_rr_cause_from_rsl_cause(lchan->release.rsl_error_cause);
-		lchan_fail("Timeout");
+		if (fi->state  == LCHAN_ST_WAIT_RLL_RTP_ESTABLISH) {
+			lchan_fail("Timeout (rll_ready=%s,voice_require=%s,voice_ready=%s)",
+				   (lchan->sapis[0] != LCHAN_SAPI_UNUSED) ? "yes" : "no",
+				   lchan-> ? "yes" : "no",
+				   lchan_rtp_established(lchan) ? "yes" : "no");
+		} else {
+			 lchan_fail("Timeout");
+		}
 		return 0;

To view, visit
To unsubscribe, or for help writing mail filters, visit

Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Change-Id: Ib655f71aec584962c70d84a4405d996505dff53c
Gerrit-Change-Number: 24890
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <pespin at>
Gerrit-MessageType: newchange
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the gerrit-log mailing list