Parallel

Click on image for animated tutorial — Forking is the process of processing multiple requests such as desktop, softphone and cell phones or finding the first-available or other call center rules and the proxy is called a Forking Proxy.  A stateless SIP proxy will act as a simple forwarding process – ex: Ethernet switch.  A stateful SIP proxy will review, route, fork, and modify the SIP header thus staying involved with the SIP dialog until BYE – ex: a Firewall.

Sequential Forking