Vishal,

If you use one line to make the line busy you are taking the "Ringless" out of it...  I doubt the end user will appreciate that first call.
I believe that true Ringless voicemail involves APIs with the carriers that allow the messages to be inserted directly into the voicemail systems.
Those APIs are accessed only by "partner"companies (companies with which they have signed agreements).  

Regards,

Guillermo



On Wed, Mar 31, 2021 at 4:43 AM Vishal Pai <vishalmpai@gmail.com> wrote:
Hello Everyone

These days lots of companies use/provide solutions for Ringless voicemail. Also I found one url stating the RVM using freeswitch.

https://www.edoceo.com/dev/call-to-voicemail

Can we use freeswitch for it. or it is provided by the carrier/gateway to drop messages directly in the VM bypass ring.

In the above URL if we refer then 2 calls are being made to make 1 line busy and second to drop vim.


Last question: Is it being legal nowadays?

Thanks

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Guillermo Ruiz Camauer