Just a coincidence, I am sure...
(a) presenters are not normally allowed to have a mobile phone with them due to the problem with interference caused to other equipment an the risk of a call sound or vibration being heard.
(b) he has her mobile number and just happens to see her on air and calls her.
(c) the news desk allow the call to be transmitted live (subject perhaps to the old “profanity” delay), without confirming the caller’s identity etc.
(d) this terrorist is happy to speak to a women, in a position of some power, while normally treating women with no respect whatsoever.
Add the above together and it was staged, but interesting. She will win all the media awards this year.