I have a client who would like to install a TTY device in their office. They have a Asterisk PBX with a CBeyond T1 to the PSTN, and the system uses the CBeyond SIPConnect facility for PSTN voice calls. The TTY device would connect with a TDM10B (FXS) card and have its own DID number. I believe the protocol between the calling TTY and the local TTY is FSK. In any case, would two TTY devices be able to communicate over an RTP stream using g711? Or should the TTY device be attached to a POTS circuit away from the PBX? Thanks, -- Michael Welter Telecom Matters Corp. Denver, Colorado US +1.303.414.4980 mike@TelecomMatters.net www.TelecomMatters.net