I've had this problem before but can't remember how to resolve it! Trying to conference in a third party on a SoundStation IP 7000 but when trying to conference in a third party, get back dial tone after dialling the number.
Any ideas please? We're using Mitel MN3300, have resolved in the past but can't remember the resolution :-(
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Oct 7, 2011 Question: Phone unable to Dial a number when Off Hook or on 2nd Call in a Conference
Resolution: Please check => here <=
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