What is CSCF in IMS?

What is CSCF in IMS?

Ericsson Call Session Control Function (CSCF) is a central component of the IP Multimedia Subsystem (IMS), managing all signaling from the end user to services and other networks.

What is 5g IMS?

The 3GPP IP Multimedia Subsystem (IMS) technology provides an architectural framework for delivering IP based multimedia services. IMS enables telecom service providers to offer a new generation of rich multimedia services across both circuit switched and packet switched networks.

What is the function of CSCF?

The Call Session Control Function (CSCF) provides the central control function in the IMS Core Network to set up, establish, modify, and tear down multimedia sessions (Figure 1.8). The CSCF function is distributed across three types of functional elements based on the specialized function they perform.

What is P-CSCF and S-CSCF?

The Call Session Control Function (CSCF) in IMS comprises three distinct roles: the Proxy CSCF (P-CSCF), the Interrogating CSCF (I-CSCF), and the Serving CSCF (S-CSCF). The CSCF is implemented via servers using the SIP protocol to communicate with each other and application servers.

Is IMS needed for 5G?

IMS (IP Multimedia Subsystem) is needed in 5G NR networks to enable packet-switched voice calls and SMS services through the VoNR (Voice over NR) technology. Standalone 5G (SA) employs the VoNR technology for voice and SMS, whereas non-standalone 5G (NSA) utilises the 4G voice technology VoLTE.

What does S-CSCF stand for?

Acronym. Definition. S-CSCF. Serving Call Session Control Function.

How UE selects CSCF?

The P-CSCF is the single entry point for all SIP messages that are sent from Tobias’s UE to the IMS. Therefore, the P-CSCF address needs to be known by the UE before the first SIP message is sent. As this address is not pre-configured in our example, it needs to be discovered by the UE.

What is the role of P-CSCF in IMS?

Interrogating Call Session Control Function (I-CSCF) is a key element in the IMS roaming methodology. It enables requests to be routed to the correct Serving Call State Control Function. As there may be several S-CSCFs either within a network, or if a roaming user requests access.

Is IMS required for 5G?

IMS is essential for delivering voice services over 4G, VoLTE, and 5G networks. Operators who have abandoned voice on 2G or 3G networks must now move on.

What is Voice over NR?

Voice over NR (VoNR) indicates a scenario where the NR network does support voice services and the 5GC offers a connection to IMS. The primary deployment focus of VoNR is standalone operation (SA) where 5GC connects to IMS supporting voice services.

What are the IMS Centralized Services (ICS) requirements?

IMS Centralized Services (ICS) Requirements Service Continuity • Service continuity shall be sustained as much as possible acrossdifferent access networks • User device and access network capabilities may have constraintson service continuity Service Consistency • Services hosted in IMS shall be available via any access networks

What are the functions of IMS ICS SCC as?

ICS SCC AS Functionalities Service Continuity Support IMS Service Continuity 51 IMS ICS SCC AS Services Continuity: IMS SC Main focus • Access Transfer –enabling service continuity between access networks

What are the different network accesses for IMS services?

– IMS services shall be consistently provided using different network accesses 4 IMS Centralized Services (ICS) Architecture IMS PSTNPSTN WLAN (IP-CAN) WLAN (IP-CAN) GSMGSM Cable DSL (IP-CAN) Cable DSL (IP-CAN) Access Networks Circuit Switch Network Circuit Switch Network Core Network User Equipments 5

What is the role of the CSCF in IMS?

The CSCF processes SIP signaling in the IMS network. Its roles include SIP proxy, interrogating function, SIP registration, and other SIP service functions.