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Internal signaling provides connection control and call progress (status) information. The H.323 standard is used for internal signaling for IP packet voice networks. H.323 defines more than simply voice. It defines a complete multimedia network (voice, video, data), with everything from devices to protocols. The H.245 standard links all the entities within H.323 by negotiating facilities among participants and H.323 network elements.
The H.323 standard makes G.711 PCM compression the default form of compression. All other compression formats are optional.
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