http://csdl2.computer.org/persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/sp/2008/3168/00/3168toc.xml&DOI=10.1109/SP.2008.21 This is very interesting. That rules out ALL VBR codecs when using SRTP for security reasons. Brian West sip:brian at freeswitch.org