• One voice line
• Music on hold*
• Call waiting
• Outbound caller ID blocking**
• Call transfer: attended and blind** ( SIP Only )
• Three-way call conferencing with local mixing
• Multiparty conferencing via external conference bridge
• Automatic redial of last calling and last called numbers
• Call pickup: selective and group*
• Call swap
• Call back on busy**
• Call blocking: anonymous and selective**
• Call forwarding: unconditional, no answer, and on busy**
• Hot line and warm line automatic calling
• Digits dialed with number auto-completion
• Anonymous caller blocking**
• Support for Uniform Resource Identifier (URI) (IP) dialing (vanity numbers)
• Multiple ring tones with selectable ring tone per line
• Call duration and start time stored in call logs in web GUI
• Distinctive ringing based on calling and called number
• 10 user-downloadable ring tones
• Speed dialing, eight entries
• Configurable dial/numbering plan support
• Intercom*
• Group paging
• Network Address Translation (NAT) Traversal, including Serial Tunnel (STUN) support
• DNS SRV and multiple A records for proxy lookup and proxy redundancy
• Syslog, debug, report generation, and event logging
• Support for highly secure encrypted voice communications
• Built-in web server for administration and configuration, with multiple security levels
• Automated remote provisioning, multiple methods; up to 256 bit encryption (HTTP, HTTPS, Trivial File Transfer Protocol [TFTP])
• Option to require administrator password to reset unit to factory defaults

**Feature requires support by call server.
**Feature activated via feature code