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17.5. Summary

In this chapter, we have analyzed how to build advanced call control services in a pure SIP environment. The tools we learned in this chapter are typically used in the context of voice and video, though nothing precludes extending their utilization to other media as well.

In scenarios that involve voice, we need to make it possible that SIP users can also communicate with users in the legacy PSTN network. In the next chapter, we will look at the architectures that enable the interoperability between the IP and the PSTN environment.


  

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