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@@ -665,6 +665,16 @@ function write2fifo($fifo_cmd, &$errors, &$status){
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granted. Be aware that without cryptography,
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security is still weak. Anyone who saw an INVITE can
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generate an acceptable REFER.
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+ <note>
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+ <para>
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+ The wrapper INVITE may or may not be used
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+ in future. The internet draft
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+ draft-ietf-sipping-service-examples
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+ mentiones the click-to-dial application
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+ without use of the dummy INVITE. As of
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+ today, most telephones do need it.
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+ </para>
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+ </note>
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<example>
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<title>Call-Flow for Click-To-Dial Using REFER</title>
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Jiri Kuthan