When implementing a dial plan for multisite deployments, what must be present for SRST to work successfully?

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When implementing a dial plan for multisite deployments, what must be present for SRST to work successfully?
A . dial peers that address all sites in the multisite cluster
B . translation patterns that apply to the local PSTN for each gateway
C . incoming and outgoing COR lists
D . configuration of the gateway as an MGCP gateway

Answer: B