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SIP Trunking
Softswitch-based, SIP-trunking solutions, which are built on a "per connection" cost model, can become costly very quickly. And, since softswitches usually are deployed with the switch vendor's choice of application server, it's difficult to gain the economy of a "best-of-breed" solution. By deploying an SSR, operators can use a session-based approach to provide fixed-line services to enterprise customers. The SSR routes on-net calls between IP PBXs and off-net calls through a PSTN gateway to local and long-distance fixed numbers. The resulting architecture creates a volume-based cost structure and reduces costs by allowing operators to select "best-of-breed" application servers.