Sip Phone Cisco Linksys SPA942 PoE 4-Line IP Telpon With 2-Port Switch Up to 4 lines with independent configuration Dual switched Ethernet ports Call logs- made, answered, missed calls, with time- 60 entries each Caller ID Multiple ringtones with selectable default ring tone per line Personal address book with auto dial- 100 entries Speed dialling Hands free option Call hold, call waiting, call transfer, call conferencing, Do not disturb. Built in web server for administration 128x64 Monochrome LCD graphical display with back light Automated provisioning- up to 256 byte encryption TFTP DHCP option 66 support HTTP HTTPS
Data Networking MAC Address (IEEE 802.3) IPv4- Internet Protocol Version 4 (RFC 791) DHCP Client- Dynamic Host Configuration Protocol (RFC 2131) ICMP- Internet Control Message Protocol (RFC 792) TCP- Transmission Control Protocol (RFC 793) UDP- User Datagram Protocol (RFC 768) RTP- Real Time Protocol (RFC 1889) (RFC 1890) RTCP- Real Time Control Protocol (RFC 1889) DiffServ (RFC 2475) Type of Service- TOS (RFC 791/1349) VLAN Tagging 802.1p/q - Layer 2 Qos SNTP- Simple Network Time Protocol (RFC 2030) ARP- Address Resolution Protocol DNS- A Record (RFC 1706) SRV Record (RFC 2782) Voice Over IP SIPv2- Session Initiation Protocol Version 2 (RFC 3261, 3262, 3263, 3264) SIP Proxy Redundancy- Dynamic via DNS SRV, A records Re-registration with Primary SIP Proxy Server SIP Support in Network Address Translation Networks- NAT (incl. STUN) SIPFrag (RFC 3420) Secure (Encrypted) Calling via Pre-Standard Implementation of Secure RTP Codec Name Assignment Voice Algorithms G.711 (A-law and mu-law) G.726 (16/24/32/40 kbps) G.729 A G.723.1 (6.3 kbps, 5.3 kbps) Jitter Buffer- Adaptive Frame Loss Concealment VAD- Voice Activity Detection w/ Silence Suppression Attenuation/Gain Adjustments MWI- Message Waiting Indicator Tones VMWI- Voice Mail Waiting Indicator Caller ID Support (Name & Number) Third Party Call control (RFC 3725) Dynamic Payload Support Adjustable Audio