Element added to online presence stanza, to inform peers with presence subscription on how to connect directly to the entity using XEP-0174: Serverless Messaging External IP address, reachable from external networks. External port number, used by external entities to reach the connected application. Local IP address, reachable from the local network (by devices having the same external IP address). Local port number, used on the local network, to reach the connected application. Represents a port number on the TCP network.