Change in osmo-bts[master]: osmo-bts-trx: send dummy FACCH in the absense of RTP frames

laforge gerrit-no-reply at lists.osmocom.org
Mon Aug 23 19:18:16 UTC 2021


laforge has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-bts/+/24846 )

Change subject: osmo-bts-trx: send dummy FACCH in the absense of RTP frames
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Patch Set 3:

> I guess you did check back that this does not interfere with DTX somehow but I am also not sure what happens on the RTP side during a DTX silence period. I just wanted to make sure that you are aware of this.

As far as I remember: On the downlink RTP side you would get AMR frames with a longer duration than the normal 20ms (IIRC 160ms or so?) and the content of the frames are SID_UPDATE frames, which just update the comfort noise generation in the MS.


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Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Change-Id: I868afecbcb6890f40c8f146e3ce00e836b794dd3
Gerrit-Change-Number: 24846
Gerrit-PatchSet: 3
Gerrit-Owner: fixeria <vyanitskiy at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: dexter <pmaier at sysmocom.de>
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-Reviewer: osmith <osmith at sysmocom.de>
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