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<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Hi!<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Here's
my logic:<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>[…]<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>if(is_method("INVITE"))</span></font><font
size=2 face=Arial><span lang=HE dir=RTL style='font-size:10.0pt;font-family:
Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><span dir=LTR></span><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'><span dir=LTR></span> { if(perl_exec("call_backend"))
{ ….. <o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>[…]<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>if(is_method("CANCEL"))
{<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;text-indent:36.0pt;
direction:ltr;unicode-bidi:embed'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>if(t_check_trans())</span></font><font
size=2 face=Arial><span lang=HE dir=RTL style='font-size:10.0pt;font-family:
Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><span dir=LTR></span><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'><span dir=LTR></span> {</span></font><font
size=2 face=Arial><span lang=HE dir=RTL style='font-size:10.0pt;font-family:
Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><span dir=LTR></span><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'><span dir=LTR></span> if(!t_relay())</span></font><font
size=2 face=Arial><span lang=HE dir=RTL style='font-size:10.0pt;font-family:
Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><span dir=LTR></span><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'><span dir=LTR></span> {</span></font><font
size=2 face=Arial><span lang=HE dir=RTL style='font-size:10.0pt;font-family:
Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><span dir=LTR></span><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'><span dir=LTR></span> sl_reply_error();</span></font><font
size=2 face=Arial><span lang=HE dir=RTL style='font-size:10.0pt;font-family:
Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><span dir=LTR></span><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'><span dir=LTR></span> }</span></font><font
size=2 face=Arial><span lang=HE dir=RTL style='font-size:10.0pt;font-family:
Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><span dir=LTR></span><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'><span dir=LTR></span> }</span></font><font
size=2 face=Arial><span lang=HE dir=RTL style='font-size:10.0pt;font-family:
Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><span dir=LTR></span><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'><span dir=LTR></span> exit;<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>}<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>The
purpose of perl_exec("call_backend") is to authenticate each call,
before the call is routed to destination.<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I
have a following problem - when UAC sends CANCEL while perl_exec is still
running. In this case t_check_trans() returns false, and CANCEL is silently
dropped, so UAC retransmits CANCEL until timer fires.<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I
wonder how I can correctly process CANCEL for transaction while perl_exec is
still running?<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>AFAIU,
if I just reply with 200 to CANCEL it's not good, because the when perl_exec
exits the transactions will be continued. And if I remove t_check_trans() it
also will make no good.<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Probably
I need to reply with 200 but really stop this transaction from been continued
after perl_exec, but I can't figure out how to do it.<o:p></o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>--</span></font><o:p></o:p></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Best
Regards,</span></font><o:p></o:p></p>
<p class=MsoNormal dir=LTR style='text-align:left;direction:ltr;unicode-bidi:
embed'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Alex
Massover</span></font><o:p></o:p></p>
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