Carrier Grade Voice Over IP by Daniel Collins

By Daniel Collins

Voice over IP bargains affordable lengthy distance mobilephone prone, however the caliber is low. A consultant to "carrier caliber" voice over IP, this ebook indicates the best way to use signalling schemes, caliber of carrier options and present protocols to carry a high quality voice over IP carrier.

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Given that most conversations involve one person listening and one person talking at a given time, the bandwidth saved by not transmitting silence can be significant. We discuss various speechcoding schemes in detail in Chapter 3, “Speech-Coding Techniques,” and all of those schemes described can be used in VoIP systems. Therefore, VoIP offers significant advantages over circuit-switched telephony from a bandwidth-efficiency point of view. You should note, however, that the availability of these coding schemes is not something that is unique to VoIP.

Second, a given packet in a voice conversation can experience longer queuing times than the previous packet— even if they both traveled the same route. This situation is due to the fact that the network resources, and particularly the queues, that the voice packets use might also be used by other traffic in the network. In contrast to the situation in IP networks, jitter is not an issue in circuitswitched networks, because there is an open dedicated pipe from sender to receiver for the duration of the conversation.

Furthermore, the possibility exists to route the call to the most appropriate personnel at the service center (or perhaps in another service center). This feature can help avoid the hassle of a customer speaking to one representative first, who then has to transfer the customer to someone else. The results of VoIP in a call-center scenario can include better customer service, reduced queue times, increased productivity, and lower cost. IP User Devices VoIP protocols, and the Session Initiation Protocol (SIP) in particular, enable a great deal of intelligence to be placed inside the user device, rather than in the network.

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