Apologies if this has already been discussed elsewhere, I have done my best to look for the answer first.
We are currently running Cisco Unified Call Manager 4.2 throughout our company with Cisco ISR Routers at each branch site. Previously we used to use CME (mixture of versions) with Trixbox providing Fax, Voicemail and IVR at some sites. As we migrate these sites to CUCM we want to be able to integrate them with FreePBX centrally. At some point we will be upgrading CUCM to the latest version so will need our solution to support both 4.2 and 9.1.
Is it possible to acheive this setup using FreePBX? If it is, could someone point me in the right direction?
Thanks in advance for any help offered.