Configuring Virtual Interfaces

A voice call traverses two virtual interfaces. The configuration of the two virtual interfaces determines the NAT pool (media service) and the logical router interface (that is, a specific unit on a physical interface) for the call to use.

A virtual interface provides the mapping between interface names that appear in the H.248 termination ID in H.248 messages and the following:

• The media service to be used for a gate
• A physical interface on the router

Step-by-Step Procedure

To configure a virtual interface:

1. Create a virtual interface, and specify a name for the interface.
   [edit services pgcp]
   edit virtual-interface v1
2. Specify the name of the media service that contains the NAT pool to be used for gates on the virtual interface that you are configuring.
   [edit services pgcp virtual-interface v1]
   user@host#set media-service media-service-one
3. Specify the physical router interface.
   [edit services pgcp virtual-interface v1]
   user@host#set interface fe-1/0/0

Related Topics

• Chapter 27, Summary of Packet Gateway Configuration Statements in JUNOS Services Interfaces Configuration Guide.