Hi all, I realise Asterisk can accept an MS-GSM (65 byte) RTP stream and convert it to GSM etc. but can Asterisk do the reverse (i.e. send *out* a 65 byte MS-GSM stream to a client?). I would like to use the MS-GSM codec for Microsoft clients - but at the moment I am getting garbled voice probably due to the 33 byte GSM RTP coming back from * to the client. Any advice on how this might be done would be welcome. Rgds, Ray