<div dir="ltr">You can do things like "no voice hunt unassigned-number" and "no voice hunt invalid-number" on IOS to keep it from trying more dial-peers.</div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Aug 13, 2017 at 10:47 PM, Ki Wi <span dir="ltr"><<a href="mailto:kiwi.voice@gmail.com" target="_blank">kiwi.voice@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hi Group, </div><div>I have encountered this interesting problem on customer PBX. Didn't work on live system for a long time but I am pretty sure this shouldn't be a default behavior. </div><div><br></div><div>When external PSTN caller calls an unassigned number in the DID range, CUCM returns with error code 27 ( destination out of order). </div><div><br></div><div>This causes the voice gateway to retry other dial-peers. </div><div><br></div><div>There's 3 dial-peer which matches this e164 number.</div><div>1)Dial-peer 100 goes CUCM (longest match, most specific)</div><div>2)Dial-peer 200 goes CUCM (longest match, most specific)</div><div>3)Dial-peer 300 goes to PSTN (the destination-pattern is .T) </div><div><br></div><div>When dial-peer 100 and 200 "fails", the voice gateway will dial-out to PSTN via dial-peer 300. Once again, PSTN route back to the customer VG. This causes a routing loop and it can fills up all the available E1 channels quickly. </div><div><br></div><div><br></div><div><strong>Just wondering if anyone encounter the following issue and have a explanation to it? Just the engineering side of me want to get down to the root cause. </strong></div><div><br></div><div>The CUCM have "stop routing on unallocated number" turns off (false). Just in case it matters. </div><div><br></div><div>I tried to google around but can't seems to find any article that talks about </div><div>1) dial-peer behaviors (on voice gateway side) - on what error code will cisco voice gateway retry other dial-peers?</div><div>2) why CUCM returns error code 27?</div><div><br></div><div>It's a managed service system so I'm unable to do a deep dive troubleshooting. </div><div><br></div><div>The current workaround introduced is to create a dial-peer 250 with a higher preference that matches the DID range and block it. </div><div><br></div><div>This means that incoming dialed number will match to 4 dial-peers (100, 200, 250 and 300) </div><div><br></div><div>After failing on 100 and 200, the call gets block on dial-peer 250. </div><span class="HOEnZb"><font color="#888888"><div><br>-- <br></div><div class="m_4901106149497882774gmail_signature"><div dir="ltr"><div>Regards,</div><div>Ki Wi</div></div></div>
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