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ZTE's Call Session Control Function product - ZXUN CSCF, based on an architecture where access, control, and service are separated, implements unified control for fixed and mobile users and provides basic communication services and enriched multimedia services for these users. ZXUN CSCF, as the core control node in the IMS network, handles SIP signaling messages and provides user access control, network authentication, session control, service triggering, and QoS control functions. Meanwhile, due to its highly reliable architecture and flexible deployment, ZXUN CSCF is widely used in VoLTE, WoWiFi, RCS, and Fixed-Mobile Convergence (FMC) networks to provide powerful and comprehensive control function. ZXUN CSCF can be deployed either on the standard ATCA hardware or on the general-purpose COTS hardware. It supports rich virtualization functions, including automatic deployment, elasticity, failure self-heal, intelligent O&M, etc.

ZXUN CSCF Provides Enhanced Session and QoS Control

High integration

Multiple logic functional entities
Integration deployment for logic functions
Separation deployment for logic functions

Powerful interoperability

Supports fixed narrowband and broadband UEs
Supports 2G/3G/4G/5G UEs
Interworking with various networks

Easy O&M

One-click deployment
Automatic O&M
Elastic scaling
Latest Function
If you want to know the latest functions, please send email to SDNFV@zte.com.cn to apply for VIP user.
Major Function
  • Protocol Stack Function

    a) IP Protocol Stack

    b) SIP Protocol Stack

    c) Diameter Protocol Stack

    d) TCP Protocol Stack

    e) SCTP Protocol Stack

  • Basic Call Function

    a) Initial Registration, Re-Registration, Implicit Registration and De-Registration at P-CSCF

    b) Authentication and Subscription at P-CSCF

    c) P-CSCF Call Initiation and Release

    d) I-CSCF Routing Inquiry, THIG and Re-Selecting S-CSCF

    e) Initial Registration, Re-Registration, Implicit Registration, De-Registration at S-CSCF

    f) Subscription at S-CSCF

    g) S-CSCF 3rd Party Registration Notification and Registration Status Notification

    h) S-CSCF De-Registration (User-Initiated, HSS-Initiated, Network-Initiated) and Implicit De-Registration

    i) S-CSCF Authentication (AKA, HTTP Digest), Network-Initiated Re-Authentication

    j) S-CSCF Call Initiation, Fork and Release

    k) S-CSCF Service Triggering

    l) S-CSCF Emergency Call

    m) S-CSCF Media Checking

    n) Other Functions

  • Session and Message Function

    a) Message Proxy in Session

    b) Session Refreshing

    c) Session Keep-Alive


  • Network Management, Security and Billing Function

    a) Basic Network Management

    b) High Reliability and High Availability

    c) Offline Charging

    d) Load Control

    e) Redundancy

  • NFV Function

    a) Basic Software Virtualization

    b) Adaption to ZTE TECS Cloud Platform

    c) Adaption to VMWare Cloud Platform

    d) Adaption to General OpenStack Cloud Platform

    e) Enhanced Software Virtualization