<div dir="ltr">He did mention that L3 does not support OPTIONS. But yes, OPTIONs is the better solution.</div><br><div class="gmail_quote"><div dir="ltr">On Thu, Dec 20, 2018 at 11:36 AM Ryan Huff <<a href="mailto:ryanhuff@outlook.com">ryanhuff@outlook.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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Couldn't you just use voice class sip options/keepalives to mark when the ITSP is down, so CUCM marks the trunk out of service and fails to the next route group member immediately (ideally, your secondary CUBE)? Seems like thats a more natural way of doing
it versus using IP SLAs...<br>
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Thanks,</div>
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- Ryan<br>
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<div id="gmail-m_3512535673174393606divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> cisco-voip <<a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a>> on behalf of Erik Anderson <<a href="mailto:erik.anderson.85@gmail.com" target="_blank">erik.anderson.85@gmail.com</a>><br>
<b>Sent:</b> Thursday, December 20, 2018 12:03 PM<br>
<b>To:</b> cisco-voip voyp list<br>
<b>Subject:</b> [cisco-voip] SIP Fail over</font>
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<div dir="ltr">Morning Folks,
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<div>
<p style="margin:0in;font-family:Calibri;font-size:11pt">We have implemented a new SIP solution with Level 3 and found that we have outbound calling failover issues. When a CUBE loses its ability to talk to its Level 3 Peer, but can still talk to CUCM outbound
calls will still connect to the CUBE, but fail connecting to Level 3. In turn CUCM still thinks the call is connected since the CUCM SIP trunk remains up to the CUBE.</p>
<p style="margin:0in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11pt">Architecture Notes:</p>
<p style="margin:0in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11pt">4 Locations with 1 CUBE Each</p>
<p style="margin:0in;font-family:Calibri;font-size:11pt">4 CUCM SIP Trunks with each connecting to one of the 4 CUBEs</p>
<p style="margin:0in;font-family:Calibri;font-size:11pt">4 CUCM Route Groups with Various CUBE/SIP Trunks assigned a Distribution Algorithm of
<span style="font-style:italic">Top Down</span></p>
<p style="margin:0in;font-family:Calibri;font-size:11pt">Each CUBE has 2 SIP Peers</p>
<p style="margin:0in;font-family:Calibri;font-size:11pt">Each CUBE can only talk to its respective SIP peer via its local Level 3 Transport to reduce call control latency by not allowing it to use the DMVPN backup network</p>
<p style="margin:0in;font-family:Calibri;font-size:11pt">Level 3 does not support SIP Options Ping</p>
<p style="margin:0in;font-family:Calibri;font-size:11pt">CUCM Trunks have SIP Options Ping enabled</p>
<p style="margin:0in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11pt">Call Flows:</p>
<p style="margin:0in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in 0in 0in 0.375in;font-family:Calibri;font-size:11pt">Working Flow:</p>
<p style="margin:0in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in 0in 0in 0.375in;font-family:Calibri;font-size:11pt">Phone ----> SLRG ----> Route Group Member #1 ----> CUBE SIP TRUNK ----> CUBE ----> Level 3 Transport ----> Level 3 SIP Peer #1/#2 ----> Call Completes</p>
<p style="margin:0in 0in 0in 3.75in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in 0in 0in 3.75in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in 0in 0in 0.375in;font-family:Calibri;font-size:11pt">CUBE Failure:</p>
<p style="margin:0in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in 0in 0in 0.375in;font-family:Calibri;font-size:11pt">Phone ----> SLRG ----></p>
<p style="margin:0in 0in 0in 1.125in;font-family:Calibri;font-size:11pt"> Route Group Member #1 ----> CUBE SIP TRUNK --X--> CUBE (CUCM Cant Reach CUBE)</p>
<p style="margin:0in 0in 0in 1.875in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in 0in 0in 1.125in;font-family:Calibri;font-size:11pt"> CUCM Routes Call to Next Route Group Member</p>
<p style="margin:0in 0in 0in 1.875in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in 0in 0in 0.375in;font-family:Calibri;font-size:11pt"> Route Group Member #2 ----> CUBE SIP TRUNK ----> CUBE ----> Level 3 Transport ----> Level 3 SIP Peer #1/#2 ----> Call Completes</p>
<p style="margin:0in 0in 0in 0.375in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in 0in 0in 0.375in;font-family:Calibri;font-size:11pt">Level 3 Transport Failure/SIP Server Failure:</p>
<p style="margin:0in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in 0in 0in 0.375in;font-family:Calibri;font-size:11pt">Phone ----> SLRG ----></p>
<p style="margin:0in 0in 0in 1.125in;font-family:Calibri;font-size:11pt"> Route Group Member #1 ----> CUBE SIP TRUNK ----> CUBE --X--> Level 3 Transport (CUBE Cant Reach Level 3 SIP Server)</p>
<p style="margin:0in 0in 0in 1.875in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in 0in 0in 1.125in;font-family:Calibri;font-size:11pt"> CUCM Thinks Call Connects since the CUBE accepts the call, Phone gets dead air, never tries the next RG Member</p>
<p style="margin:0in 0in 0in 1.875in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11pt">My idea to fix this is to use an IPSLA to ping the pingable address on the Level 3 SIP Servers. If both address are unreachable then shutdown the CUCM Dial-Peers. This doesn’t sounds like the best way
of fixing it, but it should work. </p>
<p style="margin:0in;font-family:Calibri;font-size:11pt"> </p>
<p style="margin:0in;font-family:Calibri;font-size:11pt">If any has any other better ideas please let me know.</p>
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-- <br>
<div dir="ltr" class="gmail-m_3512535673174393606x_gmail_signature">Erik Anderson</div>
</div>
<div class="gmail-m_3512535673174393606x_gmail_signature">Telecom Manager</div>
<div class="gmail-m_3512535673174393606x_gmail_signature">Some Random Corp.</div>
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