Chapter 11. Influencing Path Selection
Thus far, this book has discussed various ways to configure a gateway to ensure that your calls go through. This chapter introduces ways to control the path that calls take and to prevent calls from being placed without adequate resources to support them.
It is usually desirable to have more than one path for a call to take. Multiple paths provide redundancy in the event of a link failure or insufficient resources and sometimes are used to reduce the transport cost of a call. These paths might consist completely of Voice over IP (VoIP), or they might be a mixture of VoIP and plain old telephone service (POTS).
When you are using VoIP, keep in mind that voice is an application on the network, and voice messages ...