A method, comprising: receiving, by a presence server, a publication of presence information associated with a user, the presence information comprising a human-readable address (ADDRESS-A) for the user; receiving, by a first call session control function, a request for establishing an emergency session from the user, the first call session control function representing a multimedia session processing server; routing the emergency session to a public safety answering point node by the first call session control function, the public safety answering point node being communicatively connected to an internet protocol multimedia subsystem of a public land mobile network serving the user; determining, by the first call session control function, that the emergency session is to be established via a media gateway to a public switched telephone network, the public safety answering point node being communicatively connected to the public switched telephone network; routing a subscription for at least part of the presence information from the public safety answering point node to an inquiring call session control function in the public land mobile network serving the user, the subscription being carried in a session initiation protocol message; routing the subscription from the inquiring call session control function to a serving call session control function serving the user; routing the subscription from the serving call session control function to the presence server; receiving, by the presence server, the subscription from the public safety answering point node, the at least part of the presence information comprising the human-readable address (ADDRESS-A) for the user; determining the public safety answering point node as a source of the subscription; authorizing the subscription in response to the determination; and providing, by the presence server, the at least part of the presence information to the public safety answering point node. receiving, by a presence server, a publication of presence information associated with a user, the presence information comprising a human-readable address (ADDRESS-A) for the user; receiving, by a first call session control function, a request for establishing an emergency session from the user, the first call session control function representing a multimedia session processing server; routing the emergency session to a public safety answering point node by the first call session control function, the public safety answering point node being communicatively connected to an internet protocol multimedia subsystem of a public land mobile network serving the user; determining, by the first call session control function, that the emergency session is to be established via a media gateway to a public switched telephone network, the public safety answering point node being communicatively connected to the public switched telephone network; routing a subscription for at least part of the presence information from the public safety answering point node to an inquiring call session control function in the public land mobile network serving the user, the subscription being carried in a session initiation protocol message; routing the subscription from the inquiring call session control function to a serving call session control function serving the user; routing the subscription from the serving call session control function to the presence server; receiving, by the presence server, the subscription from the public safety answering point node, the at least part of the presence information comprising the human-readable address (ADDRESS-A) for the user; determining the public safety answering point node as a source of the subscription; authorizing the subscription in response to the determination; and providing, by the presence server, the at least part of the presence information to the public safety answering point node.