What does Cisco recommend to ensure that this cannot happen?
A. Set up the gatekeeper to allow only outgoing calls that originate internally.
B. Configure the Cisco CallManager so that the gateway terminates hairpinned calls.
C. Configure the gateway to allow only outgoing calls that originate internally.
D. Use the &quot;#&quot; digit in the service prefix so that hairpinned call attempts will fail.
Answer:D
What does Cisco recommend to ensure that this cannot happen?
A. Set up the gatekeeper to allow only outgoing calls that originate internally.
 B. Configure the Cisco CallManager so that the gateway terminates hairpinned calls.
 C. Configure the gateway to allow only outgoing calls that originate internally.
 D. Use the &quot;#&quot; digit in the service prefix so that hairpinned call attempts will fail.
