[PATCH] osmo-gsm-manuals[master]: common: bts: dyn ts: explain dyn_ts_allow_tch_f from OsmoBSC...

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Neels Hofmeyr gerrit-no-reply at lists.osmocom.org
Thu Dec 7 18:45:57 UTC 2017


Review at  https://gerrit.osmocom.org/5230

common: bts: dyn ts: explain dyn_ts_allow_tch_f from OsmoBSC viewpoint

Change-Id: If9425b16216f353515890a7b2de8590bdfa1ff38
---
M common/chapters/bts.adoc
1 file changed, 14 insertions(+), 3 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-gsm-manuals refs/changes/30/5230/1

diff --git a/common/chapters/bts.adoc b/common/chapters/bts.adoc
index b8d9f1b..116b69d 100644
--- a/common/chapters/bts.adoc
+++ b/common/chapters/bts.adoc
@@ -317,9 +317,20 @@
 
 BTS models supporting this timeslot kind are shown in <<dyn_ts_compat>>.
 
-NOTE: At the time of writing, OsmoNITB disables TCH/F on this timeslot type due
-to transcoding limitations. Operation of OsmoBSC with a third-party MSC is not
-affected by this limitation. See https://osmocom.org/issues/1778.
+In the lack of transcoding capabilities, this timeslot type may cause
+mismatching codecs to be selected for two parties of the same call, which would
+cause call routing to fail ("`Cannot patch through call with different channel
+types: local = TCH_F, remote = TCH_H`"). A workaround is to disable TCH/F on
+this timeslot type, i.e. to allow only TCH/H. To disable TCH/F on Osmocom
+style dynamic timeslots, use a configuration of
+
+----
+network
+ dyn_ts_allow_tch_f 0
+----
+
+In OsmoNITB, disabling TCH/F on Osmocom dynamic timeslots is the default. In
+OsmoBSC, the default is to allow both.
 
 ==== ip.access Style Dynamic Timeslots (TCH/F_PDCH)
 

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: If9425b16216f353515890a7b2de8590bdfa1ff38
Gerrit-PatchSet: 1
Gerrit-Project: osmo-gsm-manuals
Gerrit-Branch: master
Gerrit-Owner: Neels Hofmeyr <nhofmeyr at sysmocom.de>



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