Hello kamailio gurus,

I was wondering if there is a way to send a custom SIP NOTIFY message from kamailio to the registered SIP clients on-demand. 
For example, I want to take a kamailio node for maintainance  and want all polycom phones registered on a kamailio node to re-register and move to a different kamailio node.

I know the uac module can send custom requests via uac_req_send, but can I invoke this via a kamcmd or kamctl command ?
Any pointers/clues would be  a great help.

Thanks,
RK