Enhanced Calling Name (eCNAM)
The present document specifies the stage three (protocol description) of the Enhanced Calling Name (eCNAM) supplementary service based on stage one description in 3GPP TS 22.173 [1]. It provides the protocol details in the IP Multimedia (IM) Core Network (CN) subsystem (see 3GPP TS 24.229 [2]) based on the Session Initiation Protocol (SIP) (see RFC 3261 [3]) where the eCNAM data is retrieved by the terminating network from trusted data sources.