Draytek VIGOR2860 series User Manual page 318

Vdsl2 security firewall

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Even no voice prompt, but the RTP traffic is still secured until the call ends.

If the incoming or outgoing calls do not match any entry on the phonebook,

the router will try to make the call "being protected". But, if the call ends

up "unprotected"(e.g. peer side does not support ZRTP+SRTP), the router

will not play out a warning message.

Vigor2860 Series User's Guide