Hi,

The handover between VoWifi and VoLTE is fairly simple, as it has little to do with IMS.

Technically speaking, the data session is migrated from the PGW (LTE) to the ePDG (Wifi), using GTP on the S2b interface. The device keeps it's IP address and the the handover is fully transparent to the IMS and related systems.

If someone is at MWC in a little more than a week and wants to chat, drop me a message.

Thanks,

Carsten

Christian Hahn via sr-users <sr-users@lists.kamailio.org> schrieb am Do., 15. Feb. 2024, 09:41:

Hi all,

While researching for Open Source IMS Services I’v found the presentation “What’s up with IMS & VoLTE?” at KamailioWorld 2018.

There is a quote that raises a question:

“Things, you shouldn’t expect (at least initially):

● Seamless handover between LTE and Wifi, as this requires some integration with the PGW of the LTE”

My question is: Has the VoLTE <-> VoWiFi Handover been implemented in the meantime?

BR Christian
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