IP Telephony Cookbook by Saverio Niccolini, Jorg Ott, et al - HTML preview

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H.323 messages

Figure 5.13 A SIP/H.323 Gateway containing an H.323 Gatekeeper

3. The SIP/H.323 Gateway is independent of a proxy or a gatekeeper (Figure 5.14). User registration is done independently in the SIP and H.323 networks.