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call to unplugged or unregistered IP phones give ringback.

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crux04

Technical User
Sep 15, 2008
2
NG
CS1000E rel5. types, 2001, 1120, 1140, 2007, 2050.
When I call to unplugged/unregistered IP phones I get ringback tone. After three or five rings call goes to FDN. How can I make them give busy or overflow tone.

Thanks.
 
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