[asterisk-users] How to unregister a sip trunk

[Nikhil]

Hi
      In our asterisk we have more than 3 sip trunks.When we do "sip 
reload" from CLI/AMI we need to unregister all 3 trunks and register 
available trunks only. Now in asterisk unregisteration is not 
happening.Please help on this

Thanks
NIkhil