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When an ATA's is connected to a PBX a fast busy is heard on the PBX after the VoIP caller disconnects.

Article ID: 000125
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For PBX installations where traditional phone lines are replaced by an ATA, it may be necessary to reconfigure the ATA to enable CPC (disabled by default).

To change this, go to the web config, under Regional tab, change the value for CPC duration to some value other than 0. When SPA is the called party, CPC duration is the "voltage drop" duration, before it plays dialtone again. 

Note: CPC stands for "Calling Party Control"

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