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How does the Net-Net 4000 ensure that the pinholes are kept open for persistent communication...

How does the Net-Net 4000 ensure that the pinholes are kept open for persistent communication to SIP endpoints behind a NAT device?

A.

By sending OPTIONS messages at a defined frequency

B.

By sending ARP requests at a defined frequency

C.

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

D.

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

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