An apparatus can include a connection manager adapter that is configured to maintain presence for each of the plurality of non-IP endpoints in an IP messaging and presence protocol based on the endpoint presence data. The endpoint presence data includes a unique identifier and attribute data received for each of a plurality of non-internet protocol (IP) endpoints. The connection manager adapter can be configured to access the endpoint presence data and convert a message between the IP messaging and presence protocol and different protocol for communication with a given non-IP endpoint of the plurality of endpoints.