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The SoundPoint IP 331 is a two-line SIP phone that delivers superb sound quality as well as a wide range of supported business telephony features.The SoundPoint IP 331 phone features a full-duplex IEEE 1329 Type 1-compliant speakerphone with Polycom’s legendary Acoustic Clarity technology that delivers excellent sound quality and enables noise-free and echo-free conversations that are as natural as being there.
The SoundPoint IP 331 phone delivers through an intuitive user interface a full feature set encompassing both traditional business telephony features such as call hold, park, pick-up, transfer, and three-way local conferencing, and more advanced capabilities such as shared call/bridged line appearance, hosts built-in XML micro browser, and distinctive call treatment. |
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 Caller ID Show/Restrict |
 Quick Redial |
 Volume keys |
 Mute Key |
 Call Hold |
 Call Forward |
 3-way Call |
 Voice Mail |
| Superb sound quality and full-duplex speakerphone performance with Clarity by Polycom™ acoustic technology |  |
| Enterprise-grade feature set | |
| Easy to configure and use | |
| Integrated Power over Ethernet (PoE) support | |
| Interoperability with leading IP PBX and Softswitch platforms | |
| SIP features | |
| Integrated 802.3af PoE support | |
| Two-port 10/100 Ethernet –switch – SoundPoint IP 331 (Single 10/100 Ethernet port – SoundPoint IP 321) | |
| Small footprint | |
| Echo cancellation (ECN), Voice activity detection (VAD), Comfort noise generation (CNG) | |
| 1 x Headset jack / Sub-mini-phone 2.5 mm | |