Not long after the introduction of the VoLGA voice over LTE standard in September, AT&T and Verizon along with other telecom companies have introduced their own standards-based proposal known as One Voice.
If adopted by the 3GPP, One Voice would utilize the IMS (Internet Multimedia Subsystem) network overlay to send voice calls and SMS over LTE networks, with the companies involved in its development believing the proposed solution will allow for the widest range of compatibility for wireless network operators, equipment manufacturers and handset manufacturers while ensuring worldwide roaming over LTE networks.
One Voice is currently competing with other proposed voice over LTE delivery standards such as the aforementioned VoLGA and the 3GPP’s own Circuit Switched Fallback standard (CSFB). The CSFB standard as proposed by the 3GPP would allow LTE devices to revert to GSM or UMTS for incoming/outgoing voice calls as well as SMS.
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The terminology is wrong in the article. VoLGA is not a standard, it is an industry specification which was rejected by 3GPP. One Voice is not a standard, it is a profile selecting an initial subset of the functionality in the 3GPP standards. Therefore 3GPP will not have to adopt or approve the One Voice profile. One Voice is not competing with CS Fallback, CS Fallback is a feature used for providing voice via the legacy CS network before the One Voice profile is implemented in the IP networks (LTE).
[...] to standardize voice protocols for their respective LTE networks in the One Voice initiative in 2009. Meanwhile, T-Mobile outside of the US branch has developed the competing VoLGA (Voice Over LTE via [...]