MGCP Call Agent and Media Gateway are not able to register in the following scenario:
SIP services are used in the rulebase
MGCP service "mgcp_MG" is not used in the rulebase
MGCP connection works as expected in the following scenarios:
MGCP service is enabled (Protocol Type in the 'mgcp_MG' service properties is set to 'MGCP_UDP')
MGCP service and SIP services are not unused
In case Protocol Type in SIP services is enabled, but Protocol Type in MGCP services is disabled, the MGCP traffic will run through Early NAT. The MGCP traffic eventually fails because the Late NAT is not performed on it.