You have deployed a Cisco 2821 ISR to perform as an SRST voice gateway at a remote site. During a network failure between the remote site and the central office, some of the phones located at the remote site are unable to make phone calls.
Which two options are potential causes of the problem? (Choose two.)
A. The site has exceeded the number of SRST endpoints supported by the voice gateway.
B. The ccm-manager fallback command is configured incorrectly on the voice gateway.
C. Some Phones at the remote site are assigned a device pool without SRST reference.
D. The ccm-manager fallback-mgcp command is configured incorrectly on the voice gateway.
E. The site has exceeded the number of simultaneous calls allowed in SRST mode.
A and C are correct
E is not correct, because the number of concurrent calls is not limited by SRST.
I think the answer is A-E.
Answer C would apply if the Phone did not register.