Extension Mobility Cross Cluster

Here is my own take on EMCC:

  • Part 1 is better viewed on a large screen (Lesson learnt!)
  • Part 2 is lower res and looks good on any device

How to setup Extension Mobility Cross Cluster

One for the lab, but here are the Cisco docs:





  • Export certs to SFTP for all clusters that will participate
  • Consolidate certificates (Only on 1 server)
  • Import bulk certs into all clusters
  • Create a EMCC template
  • Add EMCC devices using template
  • Add SIP Trunks to all clusters – EMCC no IP defined – Full mesh
  • EMCC Feature Cfg and Intercluster Service Profile
  • Cluster View

In summary, if you had Site A and Site B, if youre home site is A and you visit B and logon using EMCC, the phone at B will register to the A cluster as if you were there, however there is a EMCC CSS used, which sends calls via the EMCC SIP Trunk to the ‘visited’ cluster and therefore calls are routed out of this cluster correctly. Slightly confusing!

Also a great video from the wonderful Vik Malhi at Collabcert:

Home Lab!

Well today I decided to get back into the lab at home and tidy up on some core UC skills and tasks. This is what I have achieved this weekend…

  • ESXi build
  • Layer 3 switch configuration to create networks for HQ Voice Servers + Voice VLAN/ESX Mgmt and also added my home PC to the switch so I can see all networks..
  • CUCM 10.5 Publisher build
  • Windows DNS Server (Lab.local forward look up zone)
  • 2 IP Phones registered (1 SCCP and 1 SIP)
  • RTMT for CUCM installed
  • Traces enabled
  • Played with CUCM traces and Translator X (Way cool!)
  • Real time traces with RTMT
  • CUC 10.5 Single Node Build
  • Integration with CUCM (Both SIP + SCCP methods)
  • MWI + Voicemail working (Had some issues with this and turned out just to be an issue with MWI not being enabled on the extension!! Doh!)

Note to self – This is the 1st time I have ever installed CUC. Was pretty much the same as CUCM…

One thing that I always notice in home labs…. installing CUCM and CUC is not a quick process. Also the time it takes for Tomcat to fully kick in is painful!