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With the need for dynamic call routing based on schedules to different numbers, and also connecting realtime call data with other services from CUCM - if you are developing it yourself, I would recommend you explore CURRI API / External call control ...

TCL scripts could work on the router. Github is a good place to look for the TCL scripts. It's a bit complicated and would require some clever dial peers too. CUCM actually has a built in feature to play audio prompts before connecting a call - you c...

There is Cisco native way to policy inject greetings without changing any callflow at all. Callmanager even comes with a factory greeting "your call may be monitored or recorded" greeting to play under Media Resources, Announcements, that you can req...