Product & Solution > Overview > IMS Solution   >  Infra System > CSCF
     

Call Session Control Function (CSCF) provides SIP-based call control and session handling for various multimedia service in the 3G network. It fully supports the CSCF specification for the IP Multimedia Core Network (IM-CN) defined in 3GPP Release 6 and accommodates features defined in Release 7. Telcoware CSCF supports the mandatory features of Proxy-CSCF (P-CSCF), Interrogating-CSCF (I-CSCF), and Serving-CSCF (S-CSCF) as well as BGCF and IBCF features.

P-CSCF
- Functions as initial connection point for the terminal to access the IMS
- Supports IPsec and SigComp
- Interworks with the PDF through the AF feature, and provides the QoS feature
- Supports communication for the terminal in the NAT through the IMS-ALG feature
I-CSCF
- Acts as an IMS contact point when a called subscriber tries to connect the call to the IMS (to which the subscriber belongs to)
- provides HSS interoperation as well as the THIG function defined by the standard
S-CSCF
- Manages all session states of the IMS
- Receives subscriber profile by interworking with the HSS, and interworks with the application server through the IFC
- Public Service Indicator (PSI)
BGCF
- Selects MGCF to interwork with PSTN
IBCF
- Security and NAT traversal feature for interworking between IMS networks

Subscriber registration management
P2P session setup and control
P2P messaging
Support various multimedia services
Bearer system management
Signaling compression
IPsec feature
ATCA HW-type system configuration
Compliance with international standards
- 3GPP TS 23.218, 23.228, 24.228, 24.229, 29.228, 29.229, 29.329, RFC3261, RFC3262, RFC3263, RFC3264, RFC2976