A method of a user equipment, UE,, comprising: receiving, at the UE, an Extended Local Emergency Number List, EENL, from a first Public Land Mobile Network, PLMN, the EENL provisioning at least one emergency number and associated information from which the UE can derive a Uniform Resource Name, URN; detecting, by the UE, a dialled emergency number; deriving (502, 602), by the UE, a URN from the Extended Local Emergency Number List, the URN associated with the dialled emergency number; detecting, at the UE, that the UE is attached to or registered with a second PLMN different from the first PLMN; and in response to the detecting that the UE is attached to or registered with the second PLMN different from the first PLMN, verifying whether the URN derived from the Extended Local Emergency Number List matches first characteristics, wherein the first characteristics includes one of "urn:service:sos", "um:service:sos.ambulance", "urn:service:sos.police", "urn:service:sos.fire", "urn:service:sos.marine", "urn:service:sos.mountain", and country-specific "urn:service:sos"; and if the URN matches the first characteristics, including, by the UE, the URN in a Session Initiation Protocol, SIP, INVITE message to be transmitted by the UE, wherein the transmission of the SIP INVITE message is an attempt to initiate an emergency session. receiving, at the UE, an Extended Local Emergency Number List, EENL, from a first Public Land Mobile Network, PLMN, the EENL provisioning at least one emergency number and associated information from which the UE can derive a Uniform Resource Name, URN; detecting, by the UE, a dialled emergency number; deriving (502, 602), by the UE, a URN from the Extended Local Emergency Number List, the URN associated with the dialled emergency number; detecting, at the UE, that the UE is attached to or registered with a second PLMN different from the first PLMN; and in response to the detecting that the UE is attached to or registered with the second PLMN different from the first PLMN, verifying whether the URN derived from the Extended Local Emergency Number List matches first characteristics, wherein the first characteristics includes one of "urn:service:sos", "um:service:sos.ambulance", "urn:service:sos.police", "urn:service:sos.fire", "urn:service:sos.marine", "urn:service:sos.mountain", and country-specific "urn:service:sos"; and if the URN matches the first characteristics, including, by the UE, the URN in a Session Initiation Protocol, SIP, INVITE message to be transmitted by the UE, wherein the transmission of the SIP INVITE message is an attempt to initiate an emergency session. verifying whether the URN derived from the Extended Local Emergency Number List matches first characteristics, wherein the first characteristics includes one of "urn:service:sos", "um:service:sos.ambulance", "urn:service:sos.police", "urn:service:sos.fire", "urn:service:sos.marine", "urn:service:sos.mountain", and country-specific "urn:service:sos"; and if the URN matches the first characteristics, including, by the UE, the URN in a Session Initiation Protocol, SIP, INVITE message to be transmitted by the UE, wherein the transmission of the SIP INVITE message is an attempt to initiate an emergency session.