3911 sip cant detect busy tone on external calls

Unanswered Question
Sep 30th, 2009
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3911 sip phones

-3911 sip phones calls an external number (ie mobile phone),

-the mobile phone will ring but even if you cancel the call on the mobile the 3911 still getting ring signals..

-it seems like its not detecting a busy signal from external phones..

-internaly it is ok

-other 7900 sccp phones are also okay.

what could be the possible problem in this scenario?

many thanks

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