<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2800.1589" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Hi All,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thank you for your commnets about the IAX OSP
patch. I want to clearify several things about our proposal.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>First, OSP protocol does not only be used for post
call information collection, or CDR. It is also used for call authorization and
authentication. For authorization and authentication purpose, the best way is to
pass OSP token in the first call setup message, such as INVITE message of SIP,
Q931 SETUP message of H323 and NEW of IAX. If the authorization and
authentication fail, Asterisk can deny the call immeditely without any
overhead.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Second, in our proposal, we suggest the new IAX OSP
IE type as optional. If the user does not want to use the OSP support, no any
OSP date in the NEW messages. Also as Kevin had mentioned, the OSP token for IAX
is encoded and compacted to make it as small as possible. The OSP token size for
SIP and H323 is normaly several k.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>BTW, I had discussed with Paul about his CAHNNEL
function proposal off line. I think it is a good idea. But I am not sure if it
is easy to implement. It involves all channels.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Di-Shi Sun.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></BODY></HTML>