Hi
I have a situation that I need to change the time pjsip extensions check/or register themselves with issabel.
by default they check every 1 hour.
in SIP I add below commands in sip_general_custom.conf and it resloved the problem

allowguest=no
keealive=6553500
defualtexpiry=6553500
minexpiry=600
maxexpiry=6553500
session-exires=6553500
session-mines=900

thanks all in advanced!