Ok since this is the second time someone has asked, not in my experience. I have heard of that in years gone my experience begins in 2008 and I never witnessed that happening. I doubt this will help in the quest for "the truth" but at Cablevision where I worked all the calls also recorded the rep's computer screen and you could listen to the call and see the rep typing and servicing the caller. If there was some kind of glitch in the Matrix and Vernal and Jessica's call did cross I am positive a modern call center would see that on the computer screens and of course hear the audio suddenly adding in 1 or 2 more voices. They also assuredly have what is called screen pop where when a call comes in the computer pulls up relevant information like addresses for landline based 911 calls and in this case the name of the mobile subscriber and quite possibly some kind of gps location. My opinion which is admittedly of little value is there is no way Vernal and Jessica crossed calls especially considering this was probably a small call center where the reps might actually be sitting 5 feet apart.
Isn't it important to establish why 4 voices can be heard on that recording, not just 2?
Do you know how a Barge-In is recorded, please?