... everyday business scenarios. The NC530 has an integrated speaker phone allowing Conference quality hands-free.Supporting up to 3 SIP ... accounts and 6 programmable keys, the NC530 delivers best in technology service. Superior TechnologyUsing next generation chipset the ... Voice Gain Setting, VAD, CNG·Full duplex hands-free speaker phone·SIP support SIP domain, SIP authentication (none, basic, MD5), ...