The Grandstream 1625 IP phone provides 2-lines of connectivity allowing for easy support calls and 3-way conferencing. Featuring full high definition audio (HD), calls through these phones are consistently clear so customers can always hear what your representatives have to say. This phone works very well with headsets.  With these phones, there is no need to run another cable to the desk, as it can share a connection with an existing computer. Easy to use and affordable, this is an ideal entry-level desk or wall phone for any business
 
Grandstream GXP1625 Wired Desk Phones require a wired network connection

Detailed Information
Standards: SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP, DNS (A re- cord, SRV, NAPTR), DHCP, PPPoE, SSH, TFTP, NTP, STUN, SIMPLE, LLDP-MED, LDAP, TR-069, 802.1x, TLS, SRTP
Network Interfaces: Dual switched 10/100 Ethernet ports (pass-through) with integrated PoEVoice Codecs: Support for G.711µ/a, G.722 (wide-band), G.723, G.726-32, G.729 A/B, iLBC, inband and out-of-band DTMF (In audio, RFC2833, SIP INFO), VAD, CNG, AEC, PLC, AJB, AGCQoS: Layer 2
QoS (802.1Q, 802.1P) and Layer 3 (ToS, DiffServ, MPLS) QoS