Which statement is true regarding Cisco modem relay?

A.
It supports the V.150.1 signaling standard.

B.
It is supported by some third party vendors.

C.
It requires that codec complexity be set to “high” or “flex mode”.

D.
It uses more bandwidth than modem pass-through.

E.
It is supported on H.323, MGCP, SIP, and SCCP gateways.