Key Features:
SIP 2.0 (RFC3261)
IAX2 protocol (optional)
Supports PSTN (Optional)
The possibility of recording 4 SIP accounts, also as a backup
The ability to simultaneously login to all servers
Voice Codecs: G.711a / u, G.7231 high / low, G.729a / b, G.722, G.726, iLBC, AMR-NB; AMR-WB
Video codecs: H.263, H.264, MPEG4
Video resolution: QCIF, CIF, QVGA
Photo Format: PEG GIF and BMP PNG
Video formats: MP4, 3GP and FLV
Echo cancellation: G.168 compatible with the LEC, including hands-free (AEC)
VGS, VAD, CNG, jitter buffer
Speakerphone full-duplex
Possibility of registering a domain or implementation of SIP calls peer to peer Modes DTMF inband, SIP info, RFC2833
Can be used for custom ring tones
Support for STUN
Support for the SIP SMS
Adjusting the volume in all modes (headPhone / handsfree / headPhone wire / bell)
HD voice with high quality headPhone / HD voice in speakerphone mode