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@@ -47,3 +47,19 @@ if not to me (I'm relaying for a local phone to an external address)
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proxy_authorize (once again, based on from address)
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done
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+
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+Another Concern Raised by Juha
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+------------------------------
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+What if users with valid credentials in a domain will call
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+someone, whose SIP address is rededirected/referred/forwarded
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+to an accounted PSTN destination? Callers will then "dial"
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+a sip URI (bob@iptel) which will be turned without their
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+awareness to (900-666666@iptel), challenged by gateway,
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+automatically answered by most of existing software today
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+and accounted then.
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+
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+Solutions?
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+- don't submit credentials automatically in UAC if challenge uri!=
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+ dialing uri; pop up a confirmation prompt in UA
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+- challenge with a different realm which will take authentication
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+- be restrictive and ban forwarding, REFERs, 3xx
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Jiri Kuthan