No compatible codecs, not accepting this offer

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For a few days now I’m getting

“chan_sip.c: No compatible codecs, not accepting this offer!”

on the CLI and in the messages log in irregular intervals. How can I
find out what (who) is causing this? If I turn on “sip debug” I get
flooded with SIP messages from peers/users (qualify=yes etc.) and it’s
hard to analyze.

Thanks!