I couldn't find any clean Boeing 777-style CPDLC/ACARS chime on the web, so I tried making one with Matlab. What I made is a 0.49-s 1150-Hz sinusoide followed by a 0.60-s 580-Hz sinusoid with some amplitude modulation. This is pretty much a D-D with one octave separation. I am not sure about the fidelity of the sound but it shouldn't be too bad.
acars.wav
For iPhone email notification:
new-mail.caf
A = 0.25;
T1 = 0.49;
T2 = 0.60;
Tr1 = 0.04;
Tr2 = 0.04;
f1 = 1150;
f2 = 580;
fs = 44100;
t1 = 0:1/fs:T1;
t2 = 0:1/fs:T2;
% base
y1 = A * sin(2*pi*f1*t1);
y2 = A * sin(2*pi*f2*t2);
% Envelope
k1 = 1:round(fs*Tr1);
k2 = round(fs*Tr1)+1:round(fs*T1);
y1(k1) = y1(k1) .* fliplr(sqrt(1-(k1/k1(end)).^2));
y1(k2) = y1(k2).* fliplr(k2-k2(1))/length(k2);
k1 = 1:round(fs*Tr2);
k2 = round(fs*Tr2)+1:round(fs*T2);
y2(k1) = y2(k1) .* fliplr(sqrt(1-(k1/k1(end)).^2));
y2(k2) = y2(k2).* fliplr(k2-k2(1))/length(k2);
% Concatenate
y = [y1 y2];
sound(y, fs);
