In the sample app pjsua legacy main loop, we have 300s reregistration timer. The contact address may change "IP address change detected for account..." I would like to then send a REINVITE / UPDATE if in call; how do you hook into the rereg timer: something like: rereg timer: | regc_cb() |-- acc_check_nat_addr() Ooops: IP address has change --- for all ongoing calls schedule a UPDATE or REINVITE --- HOW? Is there a way took hook into this look? Thanks Anthony