Here is a neutral and interesting summary of the provided text in one paragraph: A company was facing challenges with their existing PABX system, which didn't allow them to innovate at the speed they needed to differentiate themselves from competitors. They wanted to introduce cutting-edge features like real-time transcription into their workflow but were unsure where to start. With Twilio Programmable Voice, they found a solution that allowed them to keep their existing PABX and integrate advanced technology into their roadmap. By configuring a SIP Domain on Twilio, they could send voice traffic from their PABX to Twilio and unlock the power of programmable voice. They then set up an authentication system and configured their PABX to use a trunk to connect with Twilio. With this setup, they were able to transcribe calls in real-time using a Python Flask application and return the audio as text. This solution enabled them to augment their existing PABX capabilities without having to "rip and replace" their system or pay more for licensed features.