Hi List, Take a look at http://www.voip-info.org/wiki-Codecs. Which is de best codec to use with asterisk. Let's say that we have a asterisk that works it SIP, H323, i4l, capi, etc .. Which codec should i use if i want to make call between SIP phones ? And with H323 phones (with a gatekeeper) ? And if i want to make a call from an H323 phone to a mobile phone (GSM) ? Are there any relation between codecs and protocols ? Which is more efficient ? If anyone have a FM, please tell me so i can RTFM. Best regards, Joao Amaro - Braga, Portugal ___________________________________________________________________ O SAPO j? est? livre de v?rus com a Panda Software, fique voc? tamb?m! Clique em: http://antivirus.sapo.pt