Which two options represent a function of a Digital Signal Processor (DSP)? (Choose two.)

Which two options represent a function of a Digital Signal Processor (DSP)? (Choose two.)
A . Convert from Signaling to Audio.
B. Convert between two different Codecs.
C. Analyze and route SIP Signaling.
D. Convert between Analogue speech & Digital Audio.
E. Perform Gatekeeper functions.

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Answer: BD