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PH637

General
-   IETF SIP (RFC3261) 
-   Asterisk Compatible

Call Features 
-   Line 1 / Line 2
-   Full Duplex Speaker Phone
-   Call Forward
-   Call Transfer blind & attended
-   Do Not Disturb
-   Anonymous Caller
-   Call Mute
-   Call Hold & Resume 
-   Call Waiting 
-   Caller ID Display
-   Redial
-   Music On Hold
-   Message Waiting Indication
-   Voicemail Button
-   6 Speed Dial Buttons
-   Volume Adjustment (16 db)
-   Handfree Mic Gain Adjustment 
-   (12 db)
-   Adjustable Hook Flash Timer
-   SIP Registration Timers
-   SIP Session Timers
-   SIP Outbound Proxy
-   Inband / Outband DTMF 
-   (RFC2833, SIP-INFO)


Codec

-   G.722 wideband codec
-   G.711µ-law   
-   G.711a-law   
-   G.729a  

       
Voice Quality
-   PESQ-LQ up to 4.4 for G.711
-   PESQ-LQ up to 4.0 for G.729
-   VAD (Voice Activity Detection)
-   CNG (Comfort Noise Generator) 
-   Echo Cancellation (LEC & AEC)
-   Jitter buffer 
-   QoS 
-   RTP DSCP/ToS


IP Assignment 
-   Static IP 
-   DHCP 


Phone Menu Configurable
-   NAT Traversal 
-   STUN
-   NAT Keep Alive


Security
-   HTTP 1.1 digest authentication 
-   MD5 for SIP authentication 
-   (RFC 2069/ RFC 2617) 
-   TCP/IP 
-   IP/TCP/UDP/DHCP/RTP/ICMP/
-   HTTP/TFTP/DNS 


Configuratio
-   Web-Based Configuration
-   Firmware upgrade via TFTP


Network Interfac
-   RJ-45 x 2, 10/100BaseT
-   Auto-MDIX
-   Embedded Ethernet Switch

LCD Display
-   2 x 16 characters 


Power 
-   Input AC 100-120V / 220-240V 
-   50/60 Hz 
-   Output DC 5

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