We are looking for modem with the following specification:  Cipset Ambien / intel ITU-TV. 90 / V. 92 56, 000bps Hayes AT command Compatible 56. 000 Data Download Support Voice Function Full Duplex Speakerphone Support Video Conferencing (H. 324)  Data Compression V. 42bis / MNP5 Error Correction V. 42 / MNP2-4 Fax command Set class 1 Auto Diagnostics Looking to buy 1, 000 to 2, 000 units. For serious seller, please send email