Hardware Features • Voicemail message waiting indicator light • Voicemail message retrieval button • Volume control • Redial Button • Flash Button • Standard 12-button dialing pad • High-quality handset • One Ethernet WAN port 10/100BASE-T RJ-45 • 5 VDC universal (100-240V) switching power adaptor included Telephony Features • 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