Trying to build SIP dial out with Voice command

Hi There, I am new to Alexa skill development & Voiceflow platform, can some one guide me how to build this work flow please:

Alexa says - Welcome to xyz conference room
User says - Join my meeting or Start my meeting or Dial my bridge or dial 123456789
Alexa says - Ok & triggers a API call to my SIP endpoint

Your Support is much appreciated.

I don’t think you can use Echo device as a phone in a custom skill, currently. but you can use Twilio API or Amazon Connect to call back to your phone.

This is different from what you expect but can be helpful for using Twilio API.

I’m also interested for find someone to do this for our PBX. Recommendations?