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Been using this phone in my office for over 1 year now and I'm very pleased with it. The sound quality is very clear.
There are a few caveats that apply to all VoIP phones. First, before you can use a VoIP phone you must configure the VoIP server, in our case Asterisk, to associate the phone's MAC address with its phone extension. You can't expect to take the phone out of the package, plug it in, and start talking as you would with a regular phone.
Second, VoIP phones transmit voice over the packet-switched Internet instead of the circuit-switched network used by the "plain old telephone system" (POTS). Because packet-switched networks do not use a dedicated electrical circuit, there can be a variability in the amount of time it takes to transmit voice to or from a VoIP phone. This variability can cause temporary dropouts in voice. This quality-of-service issue is mitigated by the fact that this phone has a configurable and adaptable jitter buffer that can compensate for this variability by buffering up packets during times of delays and "shrinking" the buffer during times of silence.
Another consideration when buying Polycom phones is that firmware and configuration file updates are available only for customers of authorized Polycom resellers. You'll want to make sure you buy at least some Polycom phones from one of these resellers to keep your phones' software up to date. The firmware and configurations can be loaded from a TFTP server, so all you need to do is load the latest firmware and configuration files on the server, reboot the phones, and they all update automatically.
But luckily I had someone in the office to set it all up for me because otherwise I would have been lost.