SIP Session Agents

SIP session agents can include the following:

• softswitches
• SIP proxies
• application servers
• SIP gateways
• SIP endpoints

In addition to functioning as a single logical next hop for a signaling message (for example, where a SIP INVITE is forwarded), session agents can provide information about next or previous hops for packets in a SIP agent, including providing a list of equivalent next hops.

You can use the session agent to describe one or more SIP next or previous hops. Through the configured carriers list, you can identify the preferred carriers to use for traffic coming from the session agent. This set of carriers will be matched against the local policy for requests coming from the session agent. You can also set constraints for specific hops.