DJ77, possibly because Atlantico was talking with Dakar at the time about AF447.
At 0135, Atlantico is giving Dakar AF447's flight plan including an estimate for Tasil at 0220. At 0135:45, Dakar says to Atlantico, "-Ok, call you back, please." At 0135:46, Atlantico replies, "-Ok, ok, no problem."
Dakar called Atlantico back at 0140, and created a virtual flight plan.
About 2 1/2 hours later, things get stirring in the various ATCs over the lack of contact with AF447, which by this time should be under control of Cape Verde ATC. The concern is initiated by Cape Verde, and as the printed transcript does not convey inflection, one can't say whether Cape Verde was a bit incredulous about Dakar's que sera que sera insouciance.
The BEA report contains this paragraph re: Dakar.
"At 5 h 09 min 15 s, the ATLANTICO controller asked the DAKAR controller if he had any news of flight AF447. The DAKAR controller replied that he hadn’t and then the ATLANTICO controller requested confirmation that the flight was already in the SAL FIR. The DAKAR controller replied: "yes, no worry". He also confirmed that SAL had not established contact with flight AF447."