You configured a Cisco ISR G2 as a SIP gateway, but the gateway does not show that it is registered with Cisco Unified Communications Manager.
What is causing this issue?
A . Cisco Unified Communications Manager does not support SIP gateways.
B . The gateway does not have the UC license installed.
C . The gateway does not have Cisco Unified Border Element session licensing.
D . Cisco Unified Communications Manager does not show a SIP gateway as registered if it is not properly configured.
E . Cisco Unified Communications Manager never shows a SIP gateway as registered even when it is properly configured.
F . The Cisco ISR G2 cannot be a SIP gateway.
Answer: E