Provided is a proxy call session control function (P-CSCF) failure recovery method. The
method includes: sending, by a session management function (SMF), a SMF registration …

The present disclosure enables a UE (100) to discover a P-CSCF (85) in the IMS network
based on the services offered by the P-CSCF or the area served by the P-CSCF (85) when it …

The present disclosure discloses a service processing method and device. In this way, when
determining that an exception occurs in the packet data network gateway (PGW), the serving …

According to an aspect of the invention, there is provided a method in an IP multimedia
subsystem, IMS, of a tele-communications network. The loss of a secure association …

A method, a related apparatus, and a system for recovering a called service of a terminal are
provided. The method includes: when a called request of a user terminal is received …

A disclosure of the present specification provides a method for establishing a packer data
network (PDN) connection by a user equipment (UE). The method may comprise the steps …

A method, a related apparatus, and a system for recovering a called service of a terminal are
provided. The method includes: when a called request of a user terminal is received …

When operational, a first node of an IMS network handles a registration of a UE on the IMS
network, and receives a first request to reregister the UE with the IMS network. The first node …

Solutions for providing a data traffic session with proxy-call session control function (P-
CSCF) restoration include: receiving an indication, by an application server (AS), that a user …

A method implemented by a first network node in an IMS communication network is
provided. The method may com prise: receiving a register request from a user equipment; …