1. USB 2.0 port. 2.16 bit sound card inside, no sound card required for PC. 3. Support H.323, SIP, MGCP, IAX2 etc lot of protocol. 4. Can use for any software (for example Skype, MSN, net 2phone, etalk, Stanaphone, SJphone, X-Lite, X-PRO, Firefly,
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