Yoda VG400R, User Manual

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7.3 PBX related issues
There are some issues related to PBX system. There are: 1)
CP (Call Progress) Tone detection, and 2) Call Security.
7.3.1 CP Tone Detection
You may encounter a problem when your call goes to PBX via
a VoIP connection, such as the caller may already hang up
the phone but the PBX port is still active.
The cause of this problem may be due to the CP tone
mismatch. The VG cannot understand the Tone from PBX. So
it still considers the line is on and never hangs up.
Once this has happened, you may find a technical document
provided by your vendor that contains the corresponding
information and guides you to fix this problem.
7.3.2 Call Security
The IVG is a standard H.323 VoIP gateway that will allow any
standard H.323 device to make a VoIP connection to it. That
means no matter where you are, once you have a H.323
device such as another VG, or a software package like
Microsoft NetMeeting, you may make a VoIP call to this VG
any time once it connects to the Internet.
If the VG is only equipped with FXS port, then it should be very
little concerns regarding the unauthorized use of the VoIP link.
But once it is connected with either a PBX or PSTN line, you
may be opening a phone line for any Internet users to make
an unauthorized phone call. For example, one may make an
International call from Hong Kong to Europe through your VG
located in Singapore.
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