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Adjustable Headband, Dual earpiece headband with bigger size, Durable, light weight, rigid, Easily Repairable ( with full parts available ), Flexible Plastic Mic Boom for clear transmission, For USB Jack, Headsets for Dialers and Soft 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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Frequency Response : 80 ~ 6500Hz, Impedance : 2.5 K Ohms, Pick up Pattern : Noise Cancelling, Type : Bidirectional

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Grandstream

Yealink

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Hold, transfer, forward (unconditional/no-answer/busy), call park/pickup, 3-way
conference, shared-call-appearance (SCA) / bridged-line-appearance (BLA), downloadable phone book (XML, LDAP, up to 500 items), call waiting, call history (up
to 200 records), off-hook auto dial, auto answer, click-to-dial, flexible dial plan, hot
desking, personalized music ringtones, server redundancy & fail-over

6 VoIP accounts, One-touch speed dial, redial, Call forward, call waiting, Call transfer, call hold, Call return, group listening, Mute, auto answer, DND, 3-way conference call, Direct IP call without SIP proxy, Ring tone selection/import/delete, Hotline, emergency call, Set date time manually or automatically, Dial plan, XML Browser, Action URL/URI, Integrated Screenshots, RTCP-XR, USB port (2.0 compliant) Bluetooth earphone through BT40, Wi-Fi through WF40, USB call recording through USB flash drive, Enhanced DSS key

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

SIP v1 (RFC2543), v2 (RFC3261), Call server redundancy supported, NAT traversal: STUN mode, Proxy mode and peer-to-peer SIP link mode, IP assignment: static/DHCP, HTTP/HTTPS web server, Time and date synchronization using SNTP, UDP/TCP/DNS-SRV(RFC 3263), QoS: 802.1p/Q tagging (VLAN), Layer 3 ToS DSCP, SRTP for voice, Transport Layer Security (TLS), HTTPS certificate manager, AES encryption for configuration file, Digest authentication using MD5/MD5-sess, OpenVPN, IEEE802.1X, IPv6, LLDP/CDP/DHCP VLAN, ICE

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2 line keys with dual-color LED and 2 SIP accounts, 3 XML programmable context
sensitive soft keys, 5 (navigation, menu) keys, 8 BLF keys, 13 dedicated function keys
for MUTE, HEADSET, TRANSFER, CONFERENCE, SEND and REDIAL, SPEAKERPHONE, VOLUME, PHONEBOOK, MESSAGE, HOLD, PAGE/INTERCOM, RECORD, HOME

8 line keys with LED, 8 line keys can be programmed up to 21
paperless DSS keys (3-page view), 8 features keys: message, headset, conference, mute, hold, transfer, redial, hands-free speakerphone, 4 context-sensitive “soft” keys, 6 navigation keys, 2 volume control keys, Illuminated message key, Illuminated headset key

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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

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 1628

SIP-T27G

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SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP, DNS (A record, SRV, NAPTR), DHCP, PPPoE, SSH, TFTP, NTP, STUN, SIMPLE, LLDPMED, LDAP, TR-069, 802.1x, TLS, SRTP

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Support for G.711µ/a, G.722 (wide-band), G.723 (pending), G.726-32, G.729 A/B, in-band and out-of-band DTMF (In audio, RFC2833, SIP INFO)

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FCC: Part 15 (CFR 47) Class BCE : EN55022 Class B, EN55024, EN61000-3-2, EN61000-3-3, EN60950-1RCM: AS/ACIF S004; AS/NZS CISPR22/24; AS/NZS 60950; AS/NZS 60950.1