{"id":1055,"date":"2021-03-18T23:12:17","date_gmt":"2021-03-18T15:12:17","guid":{"rendered":"\/?p=1055"},"modified":"2021-03-18T23:12:17","modified_gmt":"2021-03-18T15:12:17","slug":"how-to-configure-a-cisco-call-manager-inter-cluster-trunk","status":"publish","type":"post","link":"https:\/\/www.insecurewi.re\/index.php\/2021\/03\/18\/how-to-configure-a-cisco-call-manager-inter-cluster-trunk\/","title":{"rendered":"How to Configure a Cisco Call Manager Inter Cluster Trunk"},"content":{"rendered":"<p>Im currently assigned a project merging two old CUCM clusters (8.x and 9.x) into a new 12.5.x cluster. Since the data is so stale we are migrating into the new cluster in stages. To do this I needed the ability to call between clusters, hence I am using Inter-Cluster Trunks. An ICT can be used as part of a migration strategy like I am doing or to allow multiple organisations to send calls between each others CUCM clusters. I have configured ICT&#8217;s on CUCM version 8.x, 9.x and 12.x and they work successfully between the versions, under the hood a Inter-Cluster Trunk are using legacy H.323 for signalling OK so lets get to it:<\/p>\n<p><strong>Steps<\/strong><br \/>\n*Note in the example I am using the prefix of # to send calls between 2 clusters. Both clusters have the same 4 digit dial plan so to prefix calls over the Inter-Cluster trunk, # it is.<br \/>\n1. On the existing cluster, Device > Trunks > Add new > Inter-Cluster Trunk (Non Gatekeeper Controlled), set device protocol to Inter-Cluster Trunk.<br \/>\n<a href=\"\/wp-content\/uploads\/2021\/03\/trunk0.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.insecurewi.re\/wp-content\/themes\/breek\/assets\/images\/transparent.gif\" data-lazy=\"true\" data-src=\"\/wp-content\/uploads\/2021\/03\/trunk0.png\" alt=\"Trunk 0\" width=\"279\" height=\"180\" class=\"aligncenter size-full wp-image-1070\" \/><\/a><br \/>\n2. Configure the trunk settings: Device Name, Device Pool, Significant Digits, Calling Search Space (select a css that has access to the Route Pattern that will use the Inter-Cluster Trunk).<br \/>\n   <a href=\"\/wp-content\/uploads\/2021\/03\/trunk1.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.insecurewi.re\/wp-content\/themes\/breek\/assets\/images\/transparent.gif\" data-lazy=\"true\" data-src=\"\/wp-content\/uploads\/2021\/03\/trunk1.png\" alt=\"Trunk 1\" width=\"1046\" height=\"831\" class=\"aligncenter size-full wp-image-1061\" data-srcset=\"https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk1.png 1046w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk1-300x238.png 300w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk1-1024x814.png 1024w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk1-768x610.png 768w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk1-100x79.png 100w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk1-566x450.png 566w\" data-sizes=\"auto, (max-width: 1046px) 100vw, 1046px\" \/><\/a><br \/>\n   Set the Incoming Calling Party Settings to Prefix with # for all types.<br \/>\n   <a href=\"\/wp-content\/uploads\/2021\/03\/trunk2.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.insecurewi.re\/wp-content\/themes\/breek\/assets\/images\/transparent.gif\" data-lazy=\"true\" data-src=\"\/wp-content\/uploads\/2021\/03\/trunk2.png\" alt=\"Trunk 2\" width=\"1566\" height=\"850\" class=\"aligncenter size-full wp-image-1062\" data-srcset=\"https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk2.png 1566w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk2-300x163.png 300w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk2-1024x556.png 1024w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk2-768x417.png 768w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk2-1536x834.png 1536w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk2-100x54.png 100w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk2-700x380.png 700w\" data-sizes=\"auto, (max-width: 1566px) 100vw, 1566px\" \/><\/a><br \/>\n   Set the Server IP Addresses of the Remote CUCM Cluster. Click Save<br \/>\n   <a href=\"\/wp-content\/uploads\/2021\/03\/trunk3.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.insecurewi.re\/wp-content\/themes\/breek\/assets\/images\/transparent.gif\" data-lazy=\"true\" data-src=\"\/wp-content\/uploads\/2021\/03\/trunk3.png\" alt=\"Remote Server IPs\" width=\"602\" height=\"110\" class=\"aligncenter size-full wp-image-1063\" data-srcset=\"https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk3.png 602w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk3-300x55.png 300w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk3-100x18.png 100w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/trunk3-600x110.png 600w\" data-sizes=\"auto, (max-width: 602px) 100vw, 602px\" \/><\/a><br \/>\n3. Configure a Route Pattern that will use this trunk:<br \/>\n   Call Routing > Route Patterns > Add New: Route Pattern = #.XXXX (hash and four digits means the remote cluster). Set the Gateway \/ Route List to the Inter-Cluster Trunk you just created. Make sure Called Party Transformations is set to discard digits PreDot.<br \/>\n   Make sure this Route Pattern is added to a Partition that is in the CSS that you set for the Inter-Cluster Trunk.<br \/>\n   <a href=\"\/wp-content\/uploads\/2021\/03\/route-pattern.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.insecurewi.re\/wp-content\/themes\/breek\/assets\/images\/transparent.gif\" data-lazy=\"true\" data-src=\"\/wp-content\/uploads\/2021\/03\/route-pattern.png\" alt=\"Route Pattern\" width=\"696\" height=\"842\" class=\"aligncenter size-full wp-image-1060\" data-srcset=\"https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/route-pattern.png 696w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/route-pattern-248x300.png 248w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/route-pattern-83x100.png 83w, https:\/\/www.insecurewi.re\/wp-content\/uploads\/2021\/03\/route-pattern-372x450.png 372w\" data-sizes=\"auto, (max-width: 696px) 100vw, 696px\" \/><\/a><br \/>\n4. Now on the new cluster repeat steps 1-3. The only change to the logic should be the Server IPs of the Remote CUCM Cluster.<br \/>\n5. So now we can make calls between the clusters by prefixing with # and four digits as all calls beginning with # are sent over the Inter-Cluster Trunk.<\/p>\n<p><strong>Common Issues<\/strong><br \/>\n1. In my experience if you get a one way audio issue, make sure all server IPs in each cluster are configured as the remote destination. In the example there are 2 IPs as for each cluster so each trunk should have 2 remote IPs (and not one).<br \/>\n2. If you get the annunciator on one or both sides of the call &#8220;your call cannot be completed as dialled..&#8221; this is almost always the CSS on the Inter-Cluster Trunk does not have partition that is assigned to the route pattern in it. You could create seperate partition and CSS for the intercluster trunk or use a over arching ones that has the correct access.<br \/>\n3. Note if the clusters are using different codecs then a Media Resource Group List is required on the Inter-Cluster Trunk configuration. This will allow transcoding via a Media Termination Point.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Im currently assigned a project merging two old CUCM clusters (8.x and 9.x) into a new 12.5.x cluster. Since the data is so stale we&#8230;<\/p>\n","protected":false},"author":2,"featured_media":1069,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24,18],"tags":[67,115,179,200],"class_list":["post-1055","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cisco","category-voip","tag-cisco","tag-inter-cluster","tag-trunk","tag-voip"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Configure a Cisco Call Manager Inter Cluster Trunk - Insecure Wire<\/title>\n<meta name=\"description\" content=\"Im currently assigned a project merging two old CUCM clusters (8.x and 9.x) into a new 12.5.x cluster. Since the data is so stale we are migrating into the new cluster in stages. 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