Describe EPC outgoing call and IMS roaming call flow

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EPC outgoing call and IMS roaming call flow

EPC outgoing call flow involves the user equipment (UE), evolved packet core (EPC), and the public switched telephone network (PSTN)
IMS roaming call flow involves the UE, visited IMS network, home IMS network, and the PSTN
Both flows involve signaling and media flows between the different network elements
EPC outgoing call flow involves the use of the Session Initiation Protocol (SIP) for signaling and the Real-time Transport Protocol (RTP) for media
IMS roaming call flow involves the use of the Diameter protocol for signaling and the RTP for media

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