Compare

1 Port, 2 Port, 4 Port, 8 Port

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No, Yes

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Yes

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Yes

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Yes

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Yes

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

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YES

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

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5 Years From Manufacturer

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Allo

Atcom

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3.2″ TFT LCD, 4 SIP accounts, 462*278 Pixel, Auto Answer, Black list, Call Center Headsets mode, Call forward, call waiting, call transfer, Call Hold, Caller ID, Dialed/Received/Missed call (each 200), Direct IP call without SIP proxy, Hot Line, Local 3-Way Conferencing, Local Phonebook (upto 1000 entries), Mute,DND, Redial, Speed Dial, Voice Mail, White list

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Anonymous call, anonymous call rejection, Call Conference, Call park, call pickup, Call Recording, DND&Call forward state synchronization, Group pickup, Intercom, paging, Music on hold

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3.2″ 462 x 278-pixel TFT LCD, Dual Gigabit Ethernet Port, PoE, WiFi, Up to 4 SIP accounts,3-way conference,Connected with up to 2x TFT LCD expansion modules (RET/AET)

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Full-duplex hands-free speakerphone with AEC (Acoustic Echo Cancellation), Voice Activity Detection (VAD), Auto Gain Control (AGC), Comfort Noise Generation (CNG), Acoustic Echo Cancellation (AEC), Packet Loss Concealment (PLC), Adaptive Jitter Buffer (AJB), Narrowband CODEC: G.711a/u, G.723.1, G.726-32K, G.729AB, 8 own ring tone, 2 custom ring tone article, 8 volume adjustable + Mute mode, Wideband codec: G.722, L16,

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AES encryption for configuration file, and P2P mode, Digest authentication using MD5/MD5-sess, DTMF: In-band, HTTP / HTTPS web server, IEEE802.1X, LAN / PC: support bridge mode, LLDP, NAT transverse: STUN mode, Open VPN support, Package tracing export, Phone lock, RFC2833, SIP connection mode: Proxy mode, SIP INFO, Support DNS SRV (RFC3263), Support QoS, Syslog, TLS, User and administrator level access control, VLAN