Exit 1Z0-400 Border Controller Implementation Essentials
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Q1 Single choice

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

  • A

    By sending messages at a defined frequency

  • B

    By sending ARP requests at a defined frequency

  • C

    By issuing PINGs to the endpoint's NAT address

  • D

    By changing the expires= parameter to a defined value in 200 OK responses to INVITEs

  • E

    By changing the expires= parameter to a defined value in 200 OK responses to REGISTERS

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