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 3195IB is an entry level VoIP phone, even it is the most cost-effective SIP phone, it also support some advance features:
-SIP and IAX2
-two accounts registered. Can connect to ISP and Private SIP server at the same time
-HD voice and a full-duplex speakerphone
-5 Speed dial keys

Phone Feature 
Languages: Segment LCD compatible worldwide
Flexible Dial Map: Fix length; End with #; Dial with time out 
Mulit-ringer selectable and user-defined ringer update via web                                                      Speakerphone 
Dial Map Table 
5 Speed dial keys
Dual register accounts 
Black list for reject authenticated call 
Reject incoming call 
Limit dialing out No. list 
No Disturb 
Caller ID, call forward, call transfer, call hold, call waiting, call forward with unconditional, busy and no answer, 3-party conference
Call log for dialed call, received call and missed call

SIP
RFC Protocol Edition: RFC3261 and RFC2543 
Compatible with all major SIP Servers: Cisco, Osip, Vocal, ser, Partysip, SIMENS, Grandstream, etc. 
DTMF Mode: RFC2833, RELAY, SIP INFO Server authentication mode: none, basic, MD5
DNS name of SIP server 
SIP signaling port setting 
NAT traverse, STUN 
NAT traverse, SIP Express router 
Public/Private server
Dual back-up servers  
Peer to peer SIP call

Physical & Environmental 
Desktop / Wall mounting 
Power adaptor Input: 100 to 240 ACV / 50/60Hz Output: 5 DCV
Dimensions: 210 x 170 x 45 mm 
Weight: 680 g (main unit) 
Operating Temperature: 0°to +40°C (32°to +104°F) 
Storage Temperature:-20°to +70°C (-40°to +158°F) 
Humidity: 5% -95% non-condensing