IP Telephony and Phones

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I am getting mix reports of users with 7900 series phones that call  an outside auto attendant (not unity, another business over PSTN) and  are unable to navigate the DTMF menu. Example press 1 for operator and it is not responding. The problem is in...

I have a large install of 7921 wireless IP phones that every so often, in the middle or on answering or making a call will just drop connection to the network and re-register themselves. with the message leaving service area.the area the phones are i...