Hi,
Unfortunately, I don't believe there is a CVP VXML Server API to get the number of active calls.
Which is a pity and I believe is needed. Something that I also would like.
What is possible is to to find the number of concurrent calls on the Cisco VVB servers - so if you check all the VVB servers and add them up - you have the total number of concurrent calls on the complete system.
Reference: https://developer.cisco.com/docs/customer-voice-portal/#!get-active-calls/get-active-calls
It is possible to get the number of concurrent ports used by the VXML server using the status.bat file (located in the admin folder).
And it is also available via JConsole.
Reference: https://orourke.tv/web/doku.php?id=vendors:cisco:uc:cvp:jconsole
Regards,
Gerry