In which three RAS messages is the technology prefix sent? (Choose three.)

A.
GRQ

B.
RRQ

C.
RCF

D.
IRR

E.
IRQ

Explanation:
The Cisco gatekeeper uses technology prefixes to group endpoints of the same type together. It uses the technology prefix appended in the called number to select the destination gateway or zone.

This method prepends a technology prefix to the called number matched by the dial-peer. It is not used for registration, but for call setup with the Cisco gatekeeper. For example, called number 5551234 becomes 1#5551234.

The technology prefix registration information is sent to the Cisco gatekeeper in the RAS Registration Request (RRQ) message. For example:

GWY-B1(config)#interface ethernet 0/0
GWY-B1(config-if)#h323-gateway voip tech-prefix 1#

-> B is correct.