DTLS failure error on inbound call

Hello All,

using Asterisk 15.3 and pjsip.

I was making an inbound call from a soft-phone to a WebRTC client and I received the following ERROR => “TLS failure occured on RTP instance ‘0x…’ due to reason ‘block type is not 01’.” The funny thing is, it worked once, but after that, I get this error.
Any Ideas?

Thank you,