Compare

32 Port, 4 Port, 8 Port, 16 Port

24 Port, 50 Port, 8 Port

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32 Port, 4 Port, 8 Port

Amount: 2 (10/100 BASE-TX (RJ-45)), Auto MDI/MDIX supported, Self-adaptive bandwidth supported

1000BaseT / 100BaseTx / 10BaseT, full / half duplex, 1x RJ-45 Gigabit Ethernet

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CDMA: 800Mhz, GSM: 850/900/1800/1900MHz, SMS CODEC: ASCII/UCS2, UMTS: 850/900/1900/2100Mhz

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3 Years From Manufacturer

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FXO, FXS

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G.711A 64 kbps, G.711U 64 kbps, G.723 5.3/6.3 kbps, G.726, G.729a (8kbps), T.38

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24 FXS ports on an RJ-21 connector, 600R, 900R or CTR-21 line impedance

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Message waiting indicator – audible, visual, Call forward – unconditional, busy, no-answer, Call transfer – blind, consultative, Call Waiting, Caller ID, Do Not Disturb, Music on hold, Three Way Calling

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Dial planner – sophisticated call routing capabilities, standalone or gatekeeper/proxy integration, Direct Dialing In (DDI), SIP registration to multiple proxies

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Sangoma

Grandstream

Dinstar

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Hold, transfer, forward, 4-way conference, call park, call pickup, shared-callappearance
(SCA)/bridged-line-appearance(BLA), downloadable phonebook
(XML, LDAP, up to 2000 items), call waiting, call log (up to 500 records), XML
customization of screen, off-hook auto dial, auto answer, click-to-dial, flexible
dial plan, hot desking, personalized music ringtones and music on hold, server redundancy and fail-over

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User and administrator level passwords, MD5 and MD5-sess based
authentication, 256-bit AES encrypted configuration file, SRTP, TLS, 802.1x
media access control

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8 line keys with up to 4 SIP accounts, 4 XML programmable context sensitive
softkeys, 5 navigation/menu keys, 11 dedicated function keys for :
MESSAGE (with LED indicator), PHONEBOOK, TRANSFER, CONFERENCE, HOLD, HEADSET, MUTE, SEND/REDIAL, SPEAKERPHONE, VOL+, VOL

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Yes, HD handset and speakerphone with support for wideband audio

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English, German, Italian, French, Spanish, Portuguese, Russian, Croatian, simplified and traditional Chinese, Korean, Japanese and more

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g Firmware upgrade via TFTP / HTTP / HTTPS, mass provisioning using TR-069 or AES encrypted XML configuration file

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GXP 2135

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SIP V2.0 RFC3261, SDP RFC2327, Session Timer RFC4028, RTP/RTCP RFC3551, SIP Registration, SIP Trunk ( Peer Mode), SIP Trunk Group, Ringback (Immediately, Alerting), Configurable SIP Release Code, DNS SRV/A Query, Outbound Proxy, DTMF mode: Signal/RFC2833, NAT Traversal Dynamic NAT, Static NAT, STUN, G.711A/U law, G.723.1, G.729A/B, Silence Suppression & Detection, Comfort Noise Generation(CNG), Voice Activity Detection(VAD), Echo Cancellation(G.168), Adaptive (Dynamic) Jitter Buffer, Call Progress Tone Generation, Programmable Gain Control