Which two data frame lengths are supported by iLBC? (Choose two.)

A.
10 milliseconds

B.
20 milliseconds

C.
30 milliseconds

D.
40 milliseconds

E.
50 milliseconds

F.
60 milliseconds

Explanation:
iLBC-Internet Low Bit Rate Codec (iLBC) provides audio quality between that of G.711 and G.729 at
bit rates of 15.2 and 13.3 kb/s, while allowing for graceful speech quality degradation in a lossy
network due to the speech frames being encoded independently. By comparison, G.729 does not

handle packet loss, delay, and jitter well, due to the dependence between speech frames. iLBC is
supported for SIP, SCCP, H323, and MGCP devices.