webrtcbin cannot "create-offer" while "data-channel" exist

[givip]

I use Gstreamer 1.17

I don't know how to make an easy reproducible case with signalling server.
Anyway will try.

In this case I received 'offer' for data-channel, I answered with
'create-answer' and data-channel established successfully.

The from peer, which answered I want to establish media-channel and
'create-offer' not working as described.

May be I have todo  'add-transceiver' to add additional connection?




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