IP Telephony and Phones

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My question is in regards to the phone model CP-8851. My group uses this phone with a shared phone line. I would like to know if there is a way to adjust the ringer setting so that the phones rings if I am not currently on a phone call, but the phone...

PD28985 by Beginner
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I would like to know if it is possible to assign something like FAC (Forced Authorization Code in CUCM) for each user in a call manager express enviroment to make outgoing PSTN calls. if the user does not have a key, he cannot make outgoing PSTN call...

We would like to use passive PoE for Cisco CP-7821 IP phones in a special application. Edit: By passive PoE I mean applying voltage without the standardized protocol that determines device class etc before the application of 48V. 1. Does the phone su...