Juan, I think you will find that the three GSM codecs are included in later versions of H.323 and H.245. Other codecs presently covered in RTP and not specified in H.323 can be signalled using the non-standards information fields in H.245. Regards, Mike Buckley ____________________ Begin Original Message ___________________________ Date: Fri Apr 16 10:37:04 -0500 1999 From: internet!ALPHA.TELECOM-CO.NET!juribe (Juan C Uribe G) Subject: A non-standard codec To: internet!MAILBAG.INTEL.COM!ITU-SG16 Content-Type: Generic-Text Content-Length: 361 Dear sirs, In the document RTP Profile for Audio and Video Conferences with Minimal Control There are description for several codecs, among them, GSM. But in H323 Version1/ V245 Version 2, there is no way to choose this codec. ¿Is there any way to work withs RTP "standard" codecs but H323-NON-standard codecs. Thanks a lot, Juan C Uribe G