GSM Audio Problems and

[Edwin Reed-Sanchez]

Holger,

classic radio interference?

- could this be caused by having amplifiers to high, and being close to
another BTS?  Should I attenuate the amplification in Osmotrx?

looks like a change of SSRC? What does RTP look like?

- where do I gather information for RTP.  Is it in the logs, or in the
configs.  We currently are not using
rtp jitter-buffer 0
in the osmobts config.

We are also getting radio link failures.

e2017-03-24_14:58:33.56803 <0004> abis_rsl.c:1035 (bts=1,trx=0,ts=1,ss=0)
CONNECTION FAIL: RELEASING state ACTIVE CAUSE=0x01(Radio Link Failure).

Will send you files in separate email.

Thanks

On Fri, Mar 24, 2017 at 10:52 AM, Holger Freyther <holger at freyther.de>
wrote:

>
> > On 24 Mar 2017, at 15:49, Edwin Reed-Sanchez <ereedsanchez at gmail.com>
> wrote:
> >
> > Dear Osmocom list
> >
> > We are getting several audio problems and dropped calls.
> > The audio sounds like static.  We are also getting large frame
> correction in the logs, and SACCH deactivation timeout.
> >
> > Any ideas what could be the likely culprit?
>
> classic radio interference?
>
>
> > 2017-03-24_14:30:57.93546 <001a> rtp_proxy.c:295 Correcting frame
> difference of 74518293571 frames
>
> looks like a change of SSRC? What does RTP look like?
>
>
>
> > 2017-03-24_14:31:11.45899 <001a> rtp_proxy.c:295 Correcting frame
> difference of 1 frames
> > 2017-03-24_14:31:11.51590 <001a> rtp_proxy.c:295 Correcting frame
> difference of 2 frames
> > 2017-03-24_14:31:11.65513 <001a> rtp_proxy.c:295 Correcting frame
> difference of 1 frames
> >
> > 2017-03-24_14:32:08.95028 <0004> abis_rsl.c:1343 (bts=1,trx=0,ts=1,ss=0)
> SACCH deactivation timeout.
> > 2017-03-24_14:37:10.11844 <0004> abis_rsl.c:662 (bts=1,trx=0,ts=1,ss=0)
> is back in operation.
>
>


-- 
Edwin Reed-Sanchez
__________________
itp.junglebrains.com
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