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@freyther.de> wrote:

> On 24 Mar 2017, at 15:49, Edwin Reed-Sanchez <ereedsanchez@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
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