A method for use in establishing a telephony session between first and second telephony devices in a telephony network, the first telephony device being associated with a multi-persona user having first and second personas, the first persona being associated with a first telephony identifier and the second persona being associated with a second telephony identifier, the method comprising, at telephony network equipment in the telephony network: receiving (S4a), from the second telephony device, a telephony session establishment request relating to the second persona; mapping (S4b) the second telephony identifier to the first telephony identifier; transmitting (S4c), to the first telephony device over a signalling link, a telephony session establishment request, the telephony session establishment request comprising the first telephony identifier and comprising a calling party identifier associated with the telephony network equipment; transmitting (S4e), to the first telephony device via a data link that is separate to the signalling link, a message comprising: data useable by the first telephony device to determine that the transmitted telephony session establishment request relates to the second persona; and/or data useable by the first telephony device to identify the second telephony device; determining (S4i) whether or not an acceptance message has been received from the first telephony device via the data link, the acceptance message indicating acceptance of the transmitted telephony session establishment request by the multi-persona user; and causing (S4j) the telephony session to be established in response to determining that the acceptance message has been received. receiving (S4a), from the second telephony device, a telephony session establishment request relating to the second persona; mapping (S4b) the second telephony identifier to the first telephony identifier; transmitting (S4c), to the first telephony device over a signalling link, a telephony session establishment request, the telephony session establishment request comprising the first telephony identifier and comprising a calling party identifier associated with the telephony network equipment; transmitting (S4e), to the first telephony device via a data link that is separate to the signalling link, a message comprising: data useable by the first telephony device to determine that the transmitted telephony session establishment request relates to the second persona; and/or data useable by the first telephony device to identify the second telephony device; data useable by the first telephony device to determine that the transmitted telephony session establishment request relates to the second persona; and/or data useable by the first telephony device to identify the second telephony device; determining (S4i) whether or not an acceptance message has been received from the first telephony device via the data link, the acceptance message indicating acceptance of the transmitted telephony session establishment request by the multi-persona user; and causing (S4j) the telephony session to be established in response to determining that the acceptance message has been received. <EOS>