Voice Options in 5G

The Voice over New Radio (VoNR) in 5G is similar to VoLTE in 4G.

In VonR, UE can have both voice & data services on 5G network.

  • 𝐃𝐨 𝐰𝐞 𝐑𝐚𝐯𝐞 π…πšπ₯π₯π›πšπœπ€ 𝐟𝐫𝐨𝐦 πŸ“π† 𝐭𝐨 πŸ’π† ?

    • Yes, we can redirect call from 5G to 4G and it’s called 𝐄𝐏𝐒 π…πšπ₯π₯π›πšπœπ€.
  • 𝐃𝐨 𝐰𝐞 𝐑𝐚𝐯𝐞 𝐒𝐑𝐕𝐂𝐂 𝐒𝐧 πŸ“π†, 𝐒 𝐦𝐞𝐚𝐧 𝐜𝐚𝐧 𝐰𝐞 π‡πŽ 𝐜𝐚π₯π₯ 𝐟𝐫𝐨𝐦 πŸ“π† 𝐭𝐨 πŸ‘π† ?

    • No, as per Rel-15, there is no support for voice call continuity between 5G and 3G Circuit Switched (CS)
  • 𝐃𝐨 𝐰𝐞 𝐑𝐚𝐯𝐞 π‚π¨π―πžπ«πšπ πž-π›πšπ¬πžπ π‡πšπ§ππ¨π―πžπ« 𝐟𝐫𝐨𝐦 πŸ“π† 𝐭𝐨 πŸ’π† ?

    • Yes, When the UE moves out of πŸ“π† coverage, inter-RAT handover is initiated, and VoLTE is provided in the LTE coverage area instead, but we must enable N26 interface between 5G-AMF & 4G-MME

𝐍𝐨𝐭𝐞: Without N26 interface Voice call handover is not possible between 5G to 4G due to Voice interruption time.

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