Model Number: QX 670 Brand Name: Cosun Key Specifications/Special Features: Supports SIP 2.0 (RFC3261) and correlative RFCsCodec: G.711 A/U Law, G.722, G.723, G.729Echo cancellation: Support G.168, and hands-free can support 96ms,hands free speaker phonesupport voice gain setting, VAD, CNGFull duplex hands-free speakerphoneNAT transverse: support STUN clientSIP support SIP domain, SIP authentication (none, basic, MD5),DNS name of server, peer to Peer/IP callSIP support 2 SIP linesCan connect to SIP1 and SIP2 server at the same timeDTMF: Support SIP info, DTMF Relay, RFC2833SIP application: support callforward/transfer/holding/waiting/3 way talking/
paging and intercom/pickup/join/call/click to dial/call park
Call control features: flexible dial map, hotline, empty calling reject, black list for reject authenticated call, limit call
No disturb, caller ID
Supports phonebook 150 records
Incoming calls/outgoing calls/missing calls
Each support 64 records
Support conference and voice record on SIP server
10 kind of ring type
Supports IAX2
Supports SRTP