... best device for Call Center;Description:NC-MG900 is a cost effective and standards-complaint VoIP Media Trunk ... RFC3578(Mapping of ISUP overlap to SIP))-Codec:G.711 U-Law and A-Law, G.711 Appendix 1, ... 723.1 and G.723.1 Annex A, G.729 Annex A and Annex B, G.726,GSM,ARM ... party number translation, second stage dialing, Auto dialing with DTMF, Ring Back tone;·Flexible call routing management; ...