Migration to VoIP over mobile networks: Technical challenges and economic opportunity analysis

In 3GPP standard, LTE networks are currently specified by considering Mobile VoIP combined with IMS for session control to ensure voice calls support. So, Mobile VoIP over LTE with IMS can be considered as a target for voice support migration from the current support in Circuit Switched (CS) Domain. Because Mobile VoIP services could potentially be supported over HSPA in the coming years and LTE coverage will probably not correspond to HSPA networks coverage before several years, it is necessary to assess if there is a potential interest and way to anticipate Mobile VoIP services launch with, first, a support over HSPA/HSPA+.