<div>Doing a no mgcp and mgcp would bring up layer 2 on your router, I have ran across this a couple of times. Didnt get deep into it to find out a permanent fix.</div>
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<div>Aman<br><br> </div>
<div><span class="gmail_quote">On 10/11/07, <b class="gmail_sendername">Caines, Max</b> <<a href="mailto:Max.Caines@wlv.ac.uk">Max.Caines@wlv.ac.uk</a>> wrote:</span>
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<div><span><font face="Arial" size="2">Hi</font></span></div>
<div><span><font face="Arial" size="2"></font></span> </div>
<div><span><font face="Arial" size="2">I don't normally deal with VoIP, so my apologies if I make simple errors. We have a 3725 router with a VWIC handling calls for one of our sites, talking to CallManager 4.1. It stopped working the other day, and after getting in the telco, who couldn't find anything wrong, and our Cisco support firm (ditto) the latter sent me a couple of URLs, one of which was to an article on this list. It pointed me to temporary fix, but not a permanent one.
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<div><span><font face="Arial" size="2"></font></span> </div>
<div><span><font face="Arial" size="2">The problem is that when the router boots or the circuit is brought up, the L2 link from the router to the telco switch won't come up. Below is the output from "show isdn status":
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<div><span><font face="Arial" size="2"></font></span> </div>
<div><span><font face="Arial" size="2">Global ISDN Switchtype = primary-net5</font></span></div>
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<div><span><font face="Arial" size="2">%Q.931 is backhauled to CCM MANAGER 0x0003 on DSL 0. Layer 3 output may not apply</font></span></div>
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<div><span><font face="Arial" size="2">ISDN Serial0/0:15 interface<br> dsl 0, interface ISDN Switchtype = primary-net5<br> L2 Protocol = Q.921 0x0000 L3 Protocol(s) = CCM MANAGER 0x0003 <br> Layer 1 Status:
<br> ACTIVE<br> Layer 2 Status:<br> TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED<br> Layer 3 Status:<br> 0 Active Layer 3 Call(s)<br> Active dsl 0 CCBs = 0<br> The Free Channel Mask: 0xFFFF7FFF
<br> Number of L2 Discards = 0, L2 Session ID = 1<br> Total Allocated ISDN CCBs = 0<br></font></span><span><font face="Arial" size="2"></font></span></div>
<div><span><font face="Arial" size="2">What I found was that I could bring the link up by doing:</font></span></div>
<div><span><font face="Arial" size="2"></font></span> </div>
<div><span>
<div><font face="Arial" size="2"><span>conf t</span></font></div>
<div><font face="Arial" size="2"><span>int ser 0/0:15</span></font></div>
<div><font face="Arial" size="2"><span>no isdn bind-l3 ccm-manager</span></font></div>
<div><font face="Arial" size="2"><span>shut</span></font></div>
<div><font face="Arial" size="2"><span>no shut</span></font></div>
<div><font face="Arial" size="2"><span>isdn bind-l3 ccm-manager</span></font></div>
<div><font face="Arial" size="2"><span></span></font> </div>
<div><font face="Arial" size="2"><span><span>After that the status is:</span></span></font></div>
<div><font face="Arial" size="2"><span><span></span></span></font> </div>
<div><font face="Arial" size="2"><span><span>Global ISDN Switchtype = primary-net5<br>ISDN Serial0/0:15 interface<br> dsl 0, interface ISDN Switchtype = primary-net5<br> Layer 1 Status:<br> ACTIVE<br> Layer 2 Status:
<br> TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED<br> Layer 3 Status:<br> 0 Active Layer 3 Call(s)<br> Active dsl 0 CCBs = 0<br> The Free Channel Mask: 0xFFFF7FFF<br> Number of L2 Discards = 0, L2 Session ID = 2
<br> Total Allocated ISDN CCBs = 0<br></span></span></font></div>
<div><font face="Arial" size="2"><span><span>However, if I reboot the router it goes back to the previous state. This clearly isn't a good situation. I've upgraded the router to 12.3(14)T7, the latest in its train, but this makes no difference. Is this a Cisco bug, or is there something else I should try? The config is attached, if it helps
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<div><font face="Arial" size="2"><span><span></span></span></font> </div>
<div><font face="Arial" size="2"><span><span>Thanks</span></span></font></div></span></div>
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<div style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; COLOR: black; LINE-HEIGHT: 1.2; FONT-FAMILY: Arial" align="left">Max Caines<br>IT Services, University of Wolverhampton<br>Wolverhampton, West Midlands WV1 1SB<br>Tel: 01902 322245 Fax: 01902 322777
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