I am planning to use an external IVR with a Freeswitch system. The phones will register with Freeswitch and forward to the external IVR for voicemails. When the external IVR receives a voicemail, I need to send a message to Freeswitch to turn on the message waiting indicator on the phone. I will be using a Multi Tenant Freeswitch system. The code will need to be programmed in C#.

What is the best way to go about this? Using the ESL API? Does anyone have any examples?

Thanks,

Ira Tessler