Compare

8E1/T1 and 240 SIP Channels, 1E1/T1 and 30 SIP channels, 2E1/T1 and 60 SIP channels, 4E1/T1 and 120 SIP channels

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SIP registration to multiple proxies

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1G802F, G.711A 64 kbps, G.711U 64 kbps, G.722 64 kbps, G.726, G.729 A/B 8 kbps

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2 T1/E1/PRI w/ RJ-45 1 10/100/1000 Ethernet

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N/A

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Digium

Sangoma

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1x SIP account, 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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128 x 40 pixel graphical LCD, 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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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, Configuration , Browser / LCD-Menu / auto-provision, HD speaker, Logging and log export, Phone lock

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DHCP / static / PPPoE, Digest authentication using MD5/MD5-sess, DNS-NAPTR/DNS- SRV (RFC 3263), HTTP / HTTPS web server, 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, v2, SRTP, Time and date synchronization by SNTP, TLS (Transport Layer Security)

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S205