Method for qualifying identity in a communication network, comprising: - a recipient terminal receiving, in a message signalling initiation of communication with said recipient terminal, said signalling message being a signalling message of the Session Initiation Protocol, SIP, at least a first identity and a second, uncertified identity of a terminal which is the initiator of said communication, said first identity being established and certified by a trusted third party, and inserted into the "P-Asserted-Identity" field of said signalling message by said trusted third party, said trusted third party being able to guarantee the content of said first identity when said first, certified identity is transmitted through said communication network via said message signalling initiation of communication to the recipient terminal, - said recipient terminal comparing said certified identity with said uncertified identity of the initiator terminal to determine whether said first and second identities are identical, and - said recipient terminal presenting, on a user interface of said recipient terminal, information representative of at least one identity from among said first and second identities of the initiator terminal, accompanied with an indication representative of said at least one presented identity of the initiator terminal being qualified as certified or not by a trusted third party, said qualification being provided by said signalling message, and said presentation comprising: • when said first and second identities are identical, presenting said identical identity with an indication of certification, and • when the first identity is different from said second identity, presenting said first and second identities, an indication of certification accompanying said first identity and/or an indication of non-certification accompanying said second identity. - a recipient terminal receiving, in a message signalling initiation of communication with said recipient terminal, said signalling message being a signalling message of the Session Initiation Protocol, SIP, at least a first identity and a second, uncertified identity of a terminal which is the initiator of said communication, said first identity being established and certified by a trusted third party, and inserted into the "P-Asserted-Identity" field of said signalling message by said trusted third party, said trusted third party being able to guarantee the content of said first identity when said first, certified identity is transmitted through said communication network via said message signalling initiation of communication to the recipient terminal, - said recipient terminal comparing said certified identity with said uncertified identity of the initiator terminal to determine whether said first and second identities are identical, and - said recipient terminal presenting, on a user interface of said recipient terminal, information representative of at least one identity from among said first and second identities of the initiator terminal, accompanied with an indication representative of said at least one presented identity of the initiator terminal being qualified as certified or not by a trusted third party, said qualification being provided by said signalling message, and said presentation comprising: • when said first and second identities are identical, presenting said identical identity with an indication of certification, and • when the first identity is different from said second identity, presenting said first and second identities, an indication of certification accompanying said first identity and/or an indication of non-certification accompanying said second identity. • when said first and second identities are identical, presenting said identical identity with an indication of certification, and • when the first identity is different from said second identity, presenting said first and second identities, an indication of certification accompanying said first identity and/or an indication of non-certification accompanying said second identity.