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<p class=MsoNormal><span lang=EN-US>Hello list,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US> I
need a hand to find the best dialplan failover solution when using two SIP Trunks.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US> My
reasons to do failover are:<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:88.8pt;text-indent:-18.0pt;
mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-US><span
style='mso-list:Ignore'>a)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>one of the two providers could
be unreachable<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:88.8pt;text-indent:-18.0pt;
mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-US><span
style='mso-list:Ignore'>b)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>both providers may be UP but one
of them could return a SIP error message (maybe caused by DOWN E1s)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US> Googling
I found a few possible solutions:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoListParagraph style='margin-left:88.8pt;text-indent:-18.0pt;
mso-list:l1 level1 lfo1'><![if !supportLists]><span lang=EN-US><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>Using DIALSTATUS variable.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:70.8pt'><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoListParagraph style='margin-left:88.8pt;text-indent:-18.0pt;
mso-list:l1 level1 lfo1'><![if !supportLists]><span lang=EN-US><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>Dialing in sequence:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> exten
=> _X.,1,Dial(SIP/${TRUNK1}/${EXTEN})<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> exten
=> _X.,2,Dial(SIP/${TRUNK2}/${EXTEN})<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='margin-left:88.8pt;text-indent:-18.0pt;
mso-list:l1 level1 lfo1'><![if !supportLists]><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'><span style='mso-list:Ignore'>3.<span
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>ChanIsAvail<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:70.8pt'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US> Using
the first method it’s possible to get the CONGESTION and CHANUNAVAIL
status which pretty much solves my problem but it takes more than 2 lines of
dialplan(I like one liners).<o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:35.4pt'><span lang=EN-US>The second solution
requires less space in the dialplan but it should work only when the called
party is busy (or maybe even when the first trunk is down).<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='text-indent:35.4pt'><span lang=EN-US>Is there a clean
way to send the call to the second SIP provider if the first one is unreachable
or spits out sip error messages?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Thanks in advance,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Alex<o:p></o:p></span></p>
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