24.12 Denial of Collect Calls
You can configure the device to reject (disconnect) incoming Tel-to-IP collect calls and to
signal this denial to the PSTN. This capability is required, for example, in the Brazilian
telecommunication system to deny collect calls. When this feature is enabled upon
rejecting the incoming call, the device sends a sequence of signals to the PSTN. This
consists of an off-hook, an on-hook after one second, and then an off-hook after two
seconds. In other words, this is in effect, a double-answer sequence.
This feature can be enabled for all calls, using the EnableFXODoubleAnswer "global"
parameter, or it can be enabled for specific calls, by enabling this feature in a Tel Profile.
Notes:
• This feature is applicable only to FXO interfaces.
• If automatic dialing is also configured for an FXO port enabled with
Denial of Collect Calls, the FXO line does not answer the incoming call
(ringing) until a SIP 200 OK is received from the remote destination.
When a 200 OK is received, a double answer is sent from the FXO line.
• Ensure that the PSTN side is configured to identify this double-answer
signal.
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