XONTEL S21P, User Manual, Page: 5 / 20

Public Broadcasting IP Phone
www.sahabtec.com
sahab tec integrated business solution
1.3 Technical Information
Phone features
WEB Multi-language
；
Support 3 accounts line
Active / passive support; Support calls holding, calls waiting and calls transfer; Call transfer
(busy turn, blind turn, consulting turn)
，
mute, don't disturb
，
Auto answer
，
three-way
conference, the volume control and so on
；
support IP direct dial without account
，
Support up
to 20 groups multicast functions simultaneously (the priority decreases from 1 to 20)
Network parameters
Support SIP V1
（
RFC2543
）
,V2
（
RFC3261
）；
Support DNS SRV
（
RFC3263
） ；
Support
STUN network penetration
；
Support 3 DTMF model: In-band,
、
RFC2833
、
SIP INFO
；
Support Network model
：
StaticIP/DHCP/PPPoE
；
built-in DNS/TFTP/FTP terminal
；
Support
NAT/DHCP service
；
Support SIP and RTP Qos
Security
Support VLAN
（
802.1pq
），
LLDP
，
VPN
（
L2TP/OPEN_VPN
）；
Support TLS
（
Transport
Layer Security
）
protocol
；
Support information authentication mechanism MD5
；
Support
AES encryption protocol
；
Support phone locks, support the Root/User level management
mode
Audio features
Wideband encoding: G.722
；
Narrow band encoding: G.711
μ/A
, G723.1, G726, G.729AB
，
iLBC
；
Support VAD,CNG,AEC,AGC etc. audio processing
；
Full duplex speaker, with
automatic echo elimination (AEC).
Physical properties