1)Support SIP 2.0 (RFC3261) and correlative RFCs; 2)Can connect to SIP1 and SIP2 server at the same time; 3)Support SIP domain Description:NC320 is a kind of voice communication terminal which is based on wide band and independent of PC (personal computer). Features:·Support SIP 2.0 (RFC3261) and correlative RFCs·Codec:G.711 A/U Law, G.723.1, G.729a/b, G.722,G.722.1, G.726·Echo cancellation: ...