Call back (camp-on) not working

@lhalepH wrote:

Hi,
I have Asterisk 13.9.1 with FreePBX distro 13.0.190.7.

I am trying the following: Extension A calls extension B. But extension B is busy. So extension A hungs up and then press *82 to request call back (camp-on request). Unfortunately call back is not initiated.

I have enabled camp-on on settings. I have tried with call waiting enabled. and call back is not initiated.
(I tried at first with call waiting disabled, which is what I prefer, but still call back is not initiated.)

On both attempts I get a weird message on the logs:

[2016-12-29 22:54:47] WARNING[4586]: res_pjsip_pubsub.c:2968 pubsub_on_rx_publish_request: No registered publish handler for event presence
[2016-12-29 22:54:47] WARNING[13643]: res_pjsip_pubsub.c:625 subscription_get_handler_from_rdata: No registered subscribe handler for event presence.winfo

Please help,
Lazaros

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