,Huawei Call Session Control Function (CSC3300), is the call control session of Huawei's IMS solution. It provides functions such as IMS user network authentication, session control, roaming mobility management and Quality of Service (QoS) control of the IMS bearer plane.

Huawei Home Subscriber Server, the HSS9820, integrates the functions of HSS and SLF of IMS. And it is the core database to store the subscriber information in the IMS subscriber home network.

The VCC is a service of fixed and mobile integration defined in the 3GPP standard.

The ATS9900 is the SIP AS to carry out telecom services and provide basic voice services, supplementary services and IP Centrex services.

The RM9000 is the large capacity resource management device of Huawei. It satisfies all requirements of 3GPP R6/3GPP R7/TISPAN for the PDF/PCRF/SPDF/A-RACF.

The IMS network realizes the integration of mobile and fixed networks. Huawei utilizes the ETSI TISPAN Network Attachment Subsystem (NASS) architecture for the fixed network subscribers to access the IMS network. The AIM6300 realizes the function of NACF and CLF in NASS architecture.

The Huawei Media Resource Controller (MRC6600) realizes the function of MRFC network element in the IMS network. The Media Resources Processor (MRP6600) realizes the function of MRFP network element. The product combing these two is called the MRS6600. The MRFC works together with the MRFP to realize the mechanism of separating the media resources control from the bearer, which can meet the need of media functions, such as audio conference, video conference, voice mailbox, video mailbox, multimedia ring back tone/picture and PoC.