Asterisk 13.3.2 res_pjsip_pubsub warning


In cli I have, for each endpoint, many warnings like this:

res_pjsip_pubsub.c:2870 pubsub_on_rx_publish_request: No registered publish handler for event presence

What is the meaning of it? How can I solve the “problem”?

Thank you…

What problem is it causing?

I have no problem, I would like to know why I have this warning…

Thank you

PJSIP has received a subscribe request for the event named “presence”. It either has no idea how to deal with this event, or, possibly, has not been configured to handle it. for what the event means.