2-8 Chapter 2System BoardsVOIP BoardThe VOIP board performs conversion of the voice data of PSTN into packet data that can betransmitted over IP networks. In other words, it provides H.323 V3-complient VoIP Gatewayfunctions to enable voice communication over the Internet. The VOIP board of the SMG-3200system comes in a VOIP board with 8 Internet telephone channels.On the VOIP board with 8 Internet telephone channels, up to 3 VOIP_Sub boards can be installed,and each VOIP_Sub board provides 8 Internet telephone channels. As a result, besides the 8Internet telephone channels of the VOIP board, a maximum of 24 additional Internet telephonechannels can be installed on a board.The features and functions of the VOIP board are as follows.y G.729A, G.723.1, G.711 audio codec supporty Internet FAX supporty Caller ID detection and generation functiony FAX/data auto-detectiony G.165 compliance, 16ms echo cancelery DTMF detection and generation functiony u-Law/A-Law supporty Input/Output Gain Controly VAD/CNG support