Free 1Z0-404 Web TestEngine Demo

Q10 Single choice

How doesthe Session Border Controller ensure that a pinhole is kept open for persistent communication to a SIP endpoint behind a NAT device?

A
by changing the expires= parameter to a defined value in 200 OK responses to REGISTERs
B
by changing the expires= parameter to a defined value in 200 OK responses to INVITEs
C
by issuing PINGs to the endpoint's NAT address
D
by sending Address Resolution Protocol (ARP) requests at a defined frequency
E
by sending messages at a defined frequency

1Z0-404 Web TestEngine demo