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2x SIP accounts, 5-way conferencing, Action URL/URI, Call forward, call waiting, call transfer, Custom ring tones / provisioning, Dial plan per account, Direct IP call, One-touch speed dial, hotline, Redial, call return, auto answer, RTCP-XR (RFC3611), VQ-RTCPXR (RFC6035), Set date time automatically or manually

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Anonymous call, anonymous call rejection, Busy Lamp Field (BLF), Call park, call pickup, Intercom, paging, Message Waiting Indicator, Music on hold, Voicemail

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Acoustic Echo Cancellation (AEC), Adaptive Jitter Buffer (AJB), Auto Gain Control (AGC), Codecs (iLBC, G.722, G.711(A/μ), GSM_FR, G.723, G.729AB, G.726 -32), Comfort Noise Generation (CNG), DTMF (In-band, RFC 2833, SIP INFO), Full-duplex hands-free speakerphone with AEC (Acoustic Echo Cancellation), HD voice ( HD handset, HD speaker), Packet Loss Concealment (PLC), Voice Activity Detection (VAD)

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132 x 48 pixel graphical LCD with backlight, Caller ID with name, number, Illuminated LEDs for line status information, Intuitive user interface with icons and soft keys, LED for call and message waiting indication, National language selection

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2 line keys with LED, 4 context-sensitive “soft” keys, 6 features keys (Headset, Speaker, Hold, Mute, Transfer, Conference), 6 navigation keys, Volume control keys

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1x RJ9 (4P4C) handset port, Dual-port 10/100 Mbps Ethernet, Power over Ethernet (IEEE 802.3af) (PoE), class 3

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Auto-provision via HTTP / HTTPS, FTP / TFTP, Auto-provision with PnP, Call hold, mute, DND, Configuration , Browser / LCD-Menu / auto-provision, HD speaker, Local tracing log export, system log, Phone lock for personal privacy protection, Reset to factory, restart, reboot

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AES encryption for conguration le, DHCP / static / PPPoE, Digest authentication using MD5/MD5-sess, DNS-NAPTR/DNS- SRV (RFC 3263), HTTP / HTTPS web server, HTTPS certicate manager, IEEE802.1X, IPV4 / IPV6, NAT Traversal STUN mode, Open VPN, QoS( 802.1p/Q tagging (VLAN) , Layer 3 ToS DSCP), SIP server / proxy redundancy, SIP v1 (RFC2543), v2 (RFC3261), SRTP, Time and date synchronization by SNTP, TLS (Transport Layer Security)

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S300

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Sangoma

Sangoma

Allo

Synway

Digium

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1 Port, 2 Port, 4 Port, 8 Port, 16 Port

1 Port, 2 Port, 4 Port, 8 Port

24 Port, 32 Port, 4 Port, 8 Port, 16 Port

1 Port, 2 Port, 4 Port, 8 Port, 16 Port

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No, Yes

No, Yes

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No, Yes

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Yes

Yes

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Yes

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Yes

Yes

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Yes

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Yes

Yes

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Yes

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Yes

Yes

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Yes

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Asterisk, Elastix, FreeBPX, FreeSWITCH, IP BRICK, trixbox, YATE

Asterisk, Elastix, FreeBPX, FreeSWITCH, IP BRICK, trixbox, YATE

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Asterisk, Elastix, FreeBPX, FreeSWITCH, IP BRICK, trixbox, YATE

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YES

YES

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YES

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Euro ISDN, Network or CPE, AT&T 4ESS, CAS Voice Modes

Euro ISDN, Network or CPE, AT&T 4ESS, CAS Voice Modes

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25 Years from Manufacturer

5 Years From Manufacturer

3 Years From Manufacturer

5 Years From Manufacturer

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Connectors: 2-32 shielded female RJ-11 jacks, Number of ports: 2-32 FXO/FXS configurable, Use multiple gateway units for higher port counts

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Connector: 2 shielded female RJ-45 jack for LAN, Network Interface: 10/100 Base-T Ethernet LAN port

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RTP/RTCP for delivery of voice, SIP per RFC 3261

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T.38 FoIP transcode fax from T.30 fax protocol (supporting V.17) modulation schemes, T.38 for transmission over a packet network

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DTMF detection, and fax tone detection, G.711 μ-Law and A-Law, G.723.1, G.729AB Silence suppression with comfort noise G.168 automatic echo cancellation Call Progress Analysis (CPA), Including Positive Voice Detection, Positive Answering Machine Detection (PAMD)

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From IP to PSTN or from PSTN to IP, IP fault tolerance, IP load balancing, User configuration list of VoIP endpoints

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FXO, FXS

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Adjustable Headband, Dual earpiece headband with bigger size, Durable, light weight, robust., Flexible Plastic Mic Boom for clear transmission, For RJ JACK/ USB with QD connector optional, Headsets for VOIP, Dialers, Soft Phones & Hard Phones, Soft leatherette ear cushions for all day comfort

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Easily Repairable ( with full parts available ), Impedance : 32-150 ohms, Leatherette ear cushions available., Optional Quick Disconnect Jack, Plastic and Rubber MIC Boom Assembly for clear transmission, SPL (at 1 kHz, 1 Vrms) : 100 dB, Stay-put click-stop headband for a perfect fit.

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•Type : Bidirectional, Frequency Response : 80 ~ 6500Hz, Impedance : 2.5 K Ohms, Pick up Pattern : Noise Cancelling, Type : Bidirectional