• Up to four lines with independent configuration and registration
• Active line indication, with name and number
• Menu-driven user interface, with support for multiple languages
• Digits dialed with number auto-completion
• Shared line appearance**
• Full-duplex speakerphone
• Call hold
• Music on hold**
• Call waiting
• Caller ID name and number
• Outbound caller ID blocking
• Call transfer - attended and blind
• Call conferencing
• Automatic redial
• On-hook dialing
• Call pickup - selective and group**
• Call park and retrieval**
• Call swap
• Call back on busy
• Call blocking - anonymous and selective
• Call forwarding - unconditional, no answer, or busy
• Hot line and warm line automatic calling
• Call logs (60 entries each) - calls made, answered, and missed
• Redial from call logs
• Personal directory with auto-dial (100 entries)
• Do not disturb (callers hear busy signal)
• Uniform Resource Identifier (URI) (IP) dialing support (vanity numbers)
• On-hook default audio configuration (speakerphone and headset)
• Multiple ring tones with selectable ring tone per line
• Called number with directory name matching
• Call number using name - directory matching or via caller ID
• Subsequent incoming calls with calling name and number
• Date and time with intelligent daylight savings support
• Call duration and start time stored in call logs
• Call timer
• Name and identity (text) displayed at startup
• Distinctive ringing based on calling and called number
• Speed dialing
• Configurable dial/numbering plan support (per line)
• Intercom** and group paging**
• DNS SRV and multiple A records for proxy lookup and proxy redundancy
• Syslog and debug server records (configurable per line)
• Report generation and event logging
• Statistics transmitted in BYE message
• Secure call encrypted voice communication support - SIP over Transport Layer Security (TLS), and Secure Real-Time Transport Protocol (SRTP)
• Built-in web server for administration and configuration with multiple security levels
• Automated provisioning, multiple methods - up to 256 bit encryption (HTTP, HTTPS, Trivial File Transfer Protocol [TFTP])
• Asynchronous notification of upgrade availability via NOTIFY
• Nonintrusive, in-service upgrades
• Optionally require administrator password to reset unit to factory defaults

** Feature requires support by call server