ACME Widgets has several geographically dispersed call centers. Calls come into the central location on H.323 gateways, and are forwarded across WAN links to the correct call centers using G.729 codecs. IVR devices in the call centers are not correctly interpreting digits entered by callers. What can be done to solve this problem?
A.
use a DTMF relay to send the digits out of band
B.
adjust the DTMF inter-digit timer on the gateway
C.
use a transcoder to convert the calls to G.711 at the call center
D.
hairpin calls back through the PSTN to the appropriate call center