Packet Core Engineer Interview Questions and Answers

The EPC (Evolved Packet Core) and IMS (IP Multimedia Subsystem) are key components in modern telecommunications networks.

• EPC protocols include GTP (GPRS Tunneling Protocol), Diameter, and S1AP (S1 Application Protocol).

• Message flows in EPC involve processes such as authentication, session establishment, and mobility management.

• IMS protocols include SIP (Session Initiation Protocol), SDP (Session Description Protocol), and RTP (Real-time Transport Protocol).

• Message flows in IM...read more

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 ...read more

GUTI stands for Globally Unique Temporary Identifier, used in LTE networks for user identification and security.

• GUTI is assigned to a user during initial attach to the network

• It is used to identify a user within the core network

• GUTI is temporary and can be changed to enhance user privacy and security

Call flow of data refers to the sequence of steps data takes from source to destination in a network.

• Data is generated at the source device

• Data is encapsulated into packets

• Packets are transmitted over the network

• Packets are received at the destination device

• Data is extracted from packets and processed at the destination