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.