It's from Wes, who is calling himself Christophe. That's his mother-given Christian name, the name he used when his mother was alive and someone hadn't shot his alleged father with a sniper rifle while standing in front of him.

How does Laurel's mom know Christophe?

On November 2, 2015, Wes was receiving a call from Laurel's mom, Sandrine Castillo, asking for him to go and meet her. She knew his real name, Christoph, and he secretly recorded their conversation once he got to the diner.

Is Wes Annalise Keating's son?

It turns out, Annalise tried to adopt Wes after his mom's death, while he was still a child. ... At one point, Annalise even called Wes her son when talking about his death, a move that makes a lot more sense now. When she looks after Christopher, it's easy to think that Annalise is reminded of the baby's dad.