![]() ![]() Now P-CSCF forward the SIP REGISTER to I-CSCF. The SIP Register contains This message includes a Public User ID, the Private User ID, and the home network SIP URI The VoLTE UE initiates a SIP REGISTER to the P-CSCF, using the P-CSCF IP Address that was made available during the LTE Attach using PCO Parameter. The First message is SIP Register which goes on Path from UE -to-> eNodeB -to-> SAEGW -to-> P-CSCF. As next step, User will connect to P-CSCF for SIP Registration on IMS Network ![]() In this case P-CSCF Address is sent to User with help of PCO Option. Here, One additional Parameter Protocol Configuration Option (PCO) is used for getting some additional information for a UE about a network that it is connecting to. SAE GW will send Create Session response to MME which completes the transaction by completing Activate default Bearer Request. The PGW ask PCRF over Gx on QOS to be supported here, PCRF replies back to PGW with QOS details which contains QCI=5 UE sends PDN Connection Request to MME in LTE Network with IMS APN, the MME sends Create Session request to SAE GW Once the PDN connection with the IMS APN is completed and the default EPS bearer is successfully created, the UE is able to communicate with the IMS Core for VoLTE call service. The IMS APN is preconfigured in the UE and its default EPS bearer has a QCI value of ‘5’ being used for SIP signaling. The UE attempts additional PDN connection with “IMS APN”. ![]()
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