NetComm V422 Reference Manual page 58

Connected to a PBX Extension Line
If the gateway is connected to a PBX extension line, then the busy tone of both the PBX and the PSTN
must be detected.
Connecting to a PBX extension line and detecting the busy tone of the PBX
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• Connect one of the PBX extension lines to the Gateway FXO Port (P4 of V431; P3 or P4 of V422).
• Detect Channel: Enter 4 (The trunk line is connected to P4, and uses P4 for outgoing detection).
• Phone Number: Set the number of the FXO line –to detect Reorder Tone.
• Dial Number: Enter the number of the end to be tested—307.
• CPT group: Enter the group to save your settings to once the test has been completed.
• Finally, click the "Accept" button.
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V400 Series VoIP Gateway User Guide
YML832 Rev1