Snom 320 IP Phone

General Features

• Dimensions: approx. 25 x 20 x 12 cm
• Weight: approx. 920 g
• Certifications: FCC Class B, CE Mark
• Power consumption: 2.1 – 2.4 watts

Connectors

• 1 x LAN, 1 x PC: RJ45 (Ethernet)
• Power: 5 V DC (Power Supply not included in box)
• Ethernet: 2 x IEEE 802.3 10/100 Mbps switch
• Power over Ethernet: IEEE 802.3af, Class 1
• Handset: RJ-4P4C connector
• Headset: RJ-4P4C connector
• Expansion Module: Proprietary Snom connector

User Interface

• 2 x 24 character, tiltable semi-graphical display with backlit
• 47 keys, 12 programmable function keys with LEDs (54 with the expansion module)
• Caller-ID
• Message waiting indication LED
• Address book (100 entries)
• Speed dialing
• Local dial plan
• Number guessing
• Lists of missed, received and dialed calls (100 entries each)
• Call waiting indication
• Clock, daylight saving, call-timer
• Call blocking (deny list)
• Blocking of anonymous calls
• Handling of up to 12 calls simultaneously
• Menu-driven user interface
• Ring tone selection, import of individual ringtones
• URL Dialing support
• National language support for selected languages (NLS)
• Do not disturb
• Speakerphone (full duplex)
• Auto answer mode
• Keyboard lock

Call Features

• Hold
• Blind transfer, attended transfer
• Music on hold support (only via PBX)
• Divert
• Conferencing (3-way conference bridge on phone)
• Call park, call pickup (only via PBX)
• Call completion
• Client Matter Code (CMC)
• Call waiting/switching between calls
• Redialing
• RTP multicast paging
• Multiple audio device support

Web Server

• Embedded web server HTTP/HTTPS
• Easy configuration of the phone, remote configuration
• Dial from web interface
• Password protection
• Diagnostics (tracing, logging, syslog)

Security, Quality of Service

• HTTPS (server/client)
• Transport Layer Security (TLS)
• SRTP (RFC3711), SIPS
• RTCP, S-RTCP
• VLAN (IEEE 802.1X)
• LLDP-MED

Codecs, Audio

• G.711 A-law, µ-law
• G.722, G.729A, G.723.1, G.726
• GSM 6.10 (full rate)
• Comfort noise, voice activity detection

SIP

• RFC3261 compliance
• UDP, TCP and TLS
• Digest/basic authentication
• PRACK (RFC3262)
• Error-information support
• Reliability of provisional responses (RFC3262)
• Early media support
• DNS SRV (RFC3263), redundant server support
• Offer/answer (RFC3264)
• Message Waiting Indication (RFC3842), subscription for MWI events (RFC3265)
• Dialog-state monitoring (RFC 4235)
• In-band DTMF/out-of-band DTMF/SIP INFO DTMF
• STUN client, ICE (NAT traversal)
• ENUM (RFC3261), NAPTR (RFC2915), rport (RFC3581), REFER (RFC3515)
• Bridged line appearance (BLA)
• Auto provisioning with PnP
• Busy lamp field support (BLF)

Installation

• Automatic software update
• Automatic settings retrieval via HTTP/HTTPS/TFTP with authentication
• Installation via web interface
• Static IP provisioning, DHCP
• NTP