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<TH align=middle colSpan=3>4.3. Authentication</TH></TR>
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<H2 class=title style="CLEAR: both"><A
id=auth-bill>4.3. Authentication</H2></DIV></DIV>
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<P>To charge individuals for used services it is necessary to have means of
authentication for registration and call signaling. This section gives an
overview on the mechanisms used for this purpose in H.323 and <SPAN
class=acronym>SIP</SPAN>.</P>
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<H3 class=title><A id=d0e2850>4.3.1. Authentication in
H.323</H3></DIV></DIV>
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<P>The H.323 protocol framework uses H.235 "⌨️ 快捷键说明
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