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When the UE powers up, it will initially attach to the IMS PDN, then the IMS app on the modem side will automatically connect to the IMS PDN for IMS registration. As soon as attach is complete, Android will use the default profile to trigger an additional PDN connect to the internet PDN.
We usually create two Profiles for the VoLTE by QMICM, the first one is for the Internet APN
and the second is for the IMS APN. The MTP will attach to the Internet APN and then initiate the PDN Connect request to the IMS APN. After the successfully IMS APN connection and QCI = 5 bear activation, the MTP will be able to send IMS SIP Register Message to the P-CSCF.
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Request: REGISTER sip:ims.mnc001.mcc001.3gppnetwork.org (1 binding) Status: 401 Unauthorized
Request: REGISTER sip:ims.mnc001.mcc001.3gppnetwork.org (1 binding) Status: 200 OK (1 binding)
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