Method for operating a user equipment with a telecommunications network and for communicating with at least two of a plurality of network functions or services of the telecommunications network or of a further telecommunications network, wherein the user equipment is operated using at least a first non-access stratum communication link and a second non-access stratum communication link, the first non-access stratum communication link being established between the user equipment and a first network function or service of the plurality of network functions or services, and the second non-access stratum communication link being established between the user equipment and a second network function or service (143, 241), wherein the first non-access stratum communication link involves establishing a first non-access stratum security context between the user equipment and the first network function or service and the second non-access stratum communication link involves establishing a second non-access stratum security context between the user equipment and the second network function or service (143, 241), wherein the operation of the user equipment, using at least the first and second non-access stratum communication links (21, 22), comprises the following steps: -- in a first step, the first non-access stratum communication link as well as the first non-access stratum security context is established using a first non-access stratum endpoint information regarding the first network function or service, and the second non-access stratum communication link as well as the second non-access stratum security context is established using a second non-access stratum endpoint information regarding the second network function or service (143, 241), wherein the first and second endpoint information is received by the user equipment, -- in a second step, the first and second non-access stratum communication links (21, 22) are used between their respective endpoints, wherein a first information element of or transmitted using the first non-access stratum security context is able to be referenced by a second information element of or transmitted using the second non-access stratum security context and/or wherein a first information element of or transmitted using the first non-access stratum security context is able to reference a second information element of or transmitted using the second non-access stratum security context, wherein one of the first and second information element, if used as a piece of referencing information, referencing the other one of the first and second information element, comprises at least one out of the following: -- a non-access stratum security context identifier information for the referenced non-access stratum communication link or the referenced non-access stratum security context, -- an information element identifier of the referenced information element. -- in a first step, the first non-access stratum communication link as well as the first non-access stratum security context is established using a first non-access stratum endpoint information regarding the first network function or service, and the second non-access stratum communication link as well as the second non-access stratum security context is established using a second non-access stratum endpoint information regarding the second network function or service (143, 241), wherein the first and second endpoint information is received by the user equipment, -- in a second step, the first and second non-access stratum communication links (21, 22) are used between their respective endpoints, wherein a first information element of or transmitted using the first non-access stratum security context is able to be referenced by a second information element of or transmitted using the second non-access stratum security context and/or wherein a first information element of or transmitted using the first non-access stratum security context is able to reference a second information element of or transmitted using the second non-access stratum security context, wherein one of the first and second information element, if used as a piece of referencing information, referencing the other one of the first and second information element, comprises at least one out of the following: -- a non-access stratum security context identifier information for the referenced non-access stratum communication link or the referenced non-access stratum security context, -- an information element identifier of the referenced information element. -- a non-access stratum security context identifier information for the referenced non-access stratum communication link or the referenced non-access stratum security context, -- an information element identifier of the referenced information element.