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Understanding NAT-Dst Allow-Incoming Table

JUNOS software supports voice over IP (VoIP) incoming calls—that is, calls that are initiated from the public network to a private network.

Before You Begin
For background information, read Destination IP Address Translation Overview.

Source pool (see Source IP Address Translation Overview) is used for source IP translation, port address translation, or both. You can enable the router to allow incoming calls when you define a source pool. When a policy is properly configured, JUNOS software performs the following tasks:

Monitors outgoing VoIP registration messages
Performs NAT on addresses within the registration messages using source pool
Stores the translation information in the allow-incoming table

When an incoming VoIP call is received from a public network, JUNOS software uses the allow-incoming table to identify the internal host to which the incoming call should be routed.

You can take advantage of this feature by using the IP address of the egress interface as a source pool or by defining a source pool on the egress interface. We recommend that you set up a source pool for larger networks or an enterprise environment; using an interface IP address is adequate for handling incoming calls in a small office.

Understanding NAT-Dst Allow-Incoming Table

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