The VoLTE call with eSRVCC enables higher quality voice calls while the network is upgrading to LTE and provides end-to-end QoS assurance. The eSRVCC was proposed by ZTE at 3GPP in 2009 and is supported by a number of operators and vendors. It was accepted into 3GPP R10 as a standard technology promotion.
“eSRVCC VoLTE call improves connection time when compared to CSFB solution and shortens handover time when compared to SRVCC solution. It gives LTE users more options and better service experience,” said ZTE Core Network Vice President Tu Jiashun. “The success of this solution is a milestone in the development of the VoLTE ecosystem.”