A method, by a first node, for handling provision of an IMS service. A communications network comprises a first slice handling a first IMS service, and a second slice handling a second IMS service. The first node obtains, from a second node at least one of a first and a second indication. The first indication is of a first routing service instance for a third node handling the first service in the first slice. The second indication is of a second routing service instance for a fourth node handling the second service in the second slice. The first node routes a request, to one of the nodes with one of the proviso that when the request is for the first service, the routing is based on the first indication, and when the request is for the second service, the routing is based on the second indication.

A method, by a first node, for handling provision of an IMS service. A communications network comprises a first slice handling a first IMS service, and a second slice handling a second IMS service. The first node obtains, from a second node at least one of a first and a second indication. The first indication is of a first routing service instance for a third node handling the first service in the first slice. The second indication is of a second routing service instance for a fourth node handling the second service in the second slice. The first node routes a request, to one of the nodes with one of the proviso that when the request is for the first service, the routing is based on the first indication, and when the request is for the second service, the routing is based on the second indication.

A method, device and medium for determining a coding format are provided. The method includes: receiving one or more data packets forwarded by a call center during a VoLTE communication, in which the one or more data packets carry a first coding format; detecting whether the first coding format is same with a negotiated second coding format; and modifying the coding format used during the VoLTE communication from the second coding format to the first coding format, if the first coding format is not same with the negotiated second coding format.

A User Equipment (UE) registers with a Long Term Evolution (LTE) network. The UE registers with an Internet Multimedia Subsystem (IMS) over the LTE network. The UE registers with a Wireless Fidelity (WIF) network. The UE receives a status request from the LTE network responsive to a Session Initiation Protocol (SIP) invite for the UE received at the IMS. The UE transfers a status response to the LTE network that indicates the WIFI network responsive to the status request. The UE receives the SIP invite from the IMS over the WIFI network. The UE exchanges user data for the media session over the WIFI network.

Aspects of the present disclosure involve systems, methods, computer program products, and the like, for implementing a registrar component or functionality in a telecommunications network. In one implementation, the registrar functionality is handled at a Session Border Controller (SBC) or Network Address Translation (NAT) Traversal Manager (NTM) device of the network to alleviate an application server of the network from performing the registration function.

Certain embodiments of the invention generally relate to lawful interception of communications for IP Multimedia System-based (IMS-based) voice over IP (VoIP). For example, some embodiments relate to interception of communications including interception for encrypted, transcoded media. A method may include identifying a network node that provides call content interception. The method may also include determining a codec type used at a location of the call content interception at the network node. The method may further include sending a matched codec of the codec type used at the location of the call content interception at the network node to a delivery function in the communications network.

A method comprising obtaining a phone number of a mobile device used by a user making an emergency call. The emergency call is conducted with a recipient through a first connection. The method also comprises transmitting a uniform resource locator (URL) to the mobile device through an electronic message. The electronic message is transmitted through a second connection using the phone number. The second connection is different from the first connection. The electronic message allows the user to click on the URL to access a web browser on the mobile device, instead of a full application on the mobile device, to establish a WebRTC (Web Real-Time Communication) session to transmit a real-time video stream from the mobile device. The URL is associated with the phone number of the mobile device. The method additionally comprises receiving the real-time video stream from the mobile device through the WebRTC session. The method further comprises sending the real-time video stream to the recipient for display on a screen of the recipient. The real-time video stream is associated with a unique identifier for the mobile. Other embodiments are described.

A method comprising obtaining a phone number of a mobile device used by a user making an emergency call. The emergency call is conducted with a recipient through a first connection. The method also comprises transmitting a uniform resource locator (URL) to the mobile device through an electronic message. The electronic message is transmitted through a second connection using the phone number. The second connection is different from the first connection. The electronic message allows the user to click on the URL to access a web browser on the mobile device, instead of a full application on the mobile device, to establish a WebRTC (Web Real-Time Communication) session to transmit a real-time video stream from the mobile device. The URL is associated with the phone number of the mobile device. The method additionally comprises receiving the real-time video stream from the mobile device through the WebRTC session. The method further comprises sending the real-time video stream to the recipient for display on a screen of the recipient. The real-time video stream is associated with a unique identifier for the mobile. Other embodiments are described.

Selecting a serving session control node in an Internet Protocol, IP, Multimedia Subsystem, IMS, telecommunication network, for a User Equipment. The method includes receiving, by an interrogating session control node, a Session Initiation Protocol, SIP register message for registering said UE in said IMS telecommunication network, the SIP register message has a UE capability feature mappable to a UE initiated server capability for the serving session control node, transmitting, by the interrogating session control node, to a Home Subscriber Server, a user authorization request message comprising the UE capability feature, receiving, by the interrogating session control node, from the Home Subscriber Server, a user authorization answer message including one or more UE initiated server capabilities for a serving session control node, selecting, by the interrogating session control node, a serving session control node based on the one or more received UE initiated server capabilities in the user authorization answer message.

Selecting a serving session control node in an Internet Protocol, IP, Multimedia Subsystem, IMS, telecommunication network, for a User Equipment. The method includes receiving, by an interrogating session control node, a Session Initiation Protocol, SIP register message for registering said UE in said IMS telecommunication network, the SIP register message has a UE capability feature mappable to a UE initiated server capability for the serving session control node, transmitting, by the interrogating session control node, to a Home Subscriber Server, a user authorization request message comprising the UE capability feature, receiving, by the interrogating session control node, from the Home Subscriber Server, a user authorization answer message including one or more UE initiated server capabilities for a serving session control node, selecting, by the interrogating session control node, a serving session control node based on the one or more received UE initiated server capabilities in the user authorization answer message.