You are asked to provide access for an external VoIP server to VoIP phones in your network using private
addresses. However, due to security concerns, the VoIP server should only be able to initiate connections to
each phone once the phone has logged into the VoIP server. The VoIP server requires access to the phones
using multiple ports.
Which type of persistent NAT is required?

A.
any-remote-host

B.
target-host

C.
target-host-port

D.
remote-host

Explanation:
http://www.juniper.net/techpubs/software/junos-security/junos-security96/junos- security-swconfigsecurity/understand-persistent-nat-section.html