You have configured SRST at a remote site on an MGCP gateway. During testing, you find that IP phones are not registering with the SRST router when the IP WAN fails.
Which three potential problems need to be investigated? (Choose three.)
A.
The ccm-manager fallback-mgcp command is missing in the SRST router.
B.
No SRST reference address is included in the device pool.
C.
The max-dn command is missing in the SRST router.
D.
No dial-peers have been added to the SRST router.
E.
The max-ephones command is missing in the SRST router.
F.
The proper service command has not been added to the SRST router.