Chan_sip peers appearing with status unknown

Recently reviewing the chan_sip peer information in a Distro install 13.0.167 three of the configured pjsip extensions appeared under chan_sip prepended with 99XXXX and showing status UNKNOWN.

Have not been able to determine what created these extensions or how to get rid of them.

All active extensions are configured as pjsip.

Insights? Thank you in advance.

WebRTC did. Remove the webrtc module.

Andrew, thank you very much for pointing that out. It is now resolved.