The first step of VOWIFI implementation is to establish an IPsec Tunnel directly between Endpoint and ePDG server, and all subsequent messages will go through this tunnel ------------- implemented √ ;
Endpoint initiates the first IMS registration request, and the server replies with 401 authentication request----------------implemented √ ;
When Endpoint initiated the authentication request for the second time, we had a problem; after the first two steps of the new SIM card, a Transport interface will be negotiated for registration; on the BT‘s SIM card, We can ignore this Transport interface and continue to use IPsec Tunnel to initiate registration, and the registration will be successful. However, for EE SIM cards, the registration we initiate again seems to be ignored (the server keeps returning 401 without any explanation of the reason for rejection), and Unable to do the IMS register. ---------------Sticking point;
I would like to know, in this case, do we use Ipsec Tunnel or Transport to continue the registration? Is there any documentation we can use?
