Screen
4.3"color-screen, 2x3.5" side color displays for DSS keys
Voice Codec
G.711a/u, G.723.1, G.726-32K, G.729AB
Protocol
SIP2.0 over UDP/TCP/TLS
Narrowband Codec
G.711a/u, G.723.1, G.726 32K, G.729AB, AMR, iLBC
DTMF
In-band, Out of Band DTMF Relay(RFC2833) / SIP INFO
IP Mode
IPv4/IPv6/IPv4&IPv6
Wideband Codec
G.722, AMR WB, Opus