Call Signaling Protocols for VoIP
VoIP (Voice over Internet Protocol) is an Internet-based telephone calling system. Instead of placing a telephone call over the standard landline system, the call occurs over the Internet. This makes them less expensive, but just as reliable.
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Call and Control Protocols
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Call control and management protocols set up a call session,and can tear it down (the hang up). H.323 is an example of this type of protocol.
Call Processing Protocols
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A processing protocol off-loads the calling information to a server for processing. SGCP is an example of this protocol. It takes the information from a Gateway (an intermediary location) to place a server on an IP network.
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Media Gateway Control Protocols
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Media Gateway Control Protocols (MGCP) can establish connections over different networks. While other call signaling protocol transfer signals from one to another, this one operates in a centralized master slave control model. This way you can connect to different protocols, such as an IP network or an ATM carrier.
Messaging and End Device Protocols
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Call signaling protocols that control messaging and conference calls allow users to work with end devices, such as VoIP phones or computers. This allows support for multimedia conferencing and instant messaging.
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References
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