Problem with encrypted onvif backchannel

[Анастасия Багно]

Hi!
I'm using gstreamer 1.14.

I need to run tls encrypted  backchannel audio.  I can get working
encrypted video stream from server to client , but no backchannel audio
stream.

I get next warnings

0:00:12.664311692  5542       0xc6bcf0 WARN                 srtpdec
gstsrtpdec.c:770:request_key_with_signal:<srtpdec0> Could not get caps for
stream with SSRC 1356955624
0:00:12.664363445  5542       0xc6bcf0 WARN                 srtpdec
gstsrtpdec.c:1212:gst_srtp_dec_chain:<srtpdec0> Invalid buffer, dropping

I've used code from test-onvif-backchannel, test-onvif, test-auth-record
examples.

My pipelines:
Server backchannel pipeline -

capsfilter caps=\"application/x-rtp, media=audio, payload=0,
clock-rate=8000, encoding-name=PCMU\" name=depay_backchannel ! rtppcmudepay
! "
        "  tee name=t ! queue ! pulsesink async=false

Server main pipeline -

videotestsrc is-live=true ! x264enc ! rtph264pay name=pay0 pt=96

Client main pipeline

rtspsrc location=rtsps://user:password@127.0.0.1:8554/test
tls-validation-flags=generic-error name=rtsp_source backchannel=onvif   "
//protocols=0x1+0x20
    " ! capsfilter caps=application/x-rtp,media=video ! queue !  decodebin
! queue ! xvimagesink async=false

Client backchannel audio -

"audiotestsrc is-live=true wave=red-noise ! mulawenc ! rtppcmupay  ! "
            " \'application/x-rtp, payload=(int)8, ssrc=(uint)1356955624\'
! srtpenc
key=\"012345678901234567890123456789012345678901234567890123456789\" ! "
            " appsink name=out"

The problem, I can see it's improper caps in server backchannel pipeline,
but I don't know how to fix it.

Could You please give any advice to get working solution?

Best Regards,
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