Telephony application server node, server node, and methods therein, in a communications network

A method performed by a server node handling categorization data associated to a first device in an incoming call invitation from the first device to a second device in a communications network, the method comprising:

• creating a number of respective data delta, each data delta relating to a respective device out of a number of devices at a respective subsequent point in time, which respective data delta comprises only categorization data that is updated compared to categorization data relating to a point in time that is earlier than the subsequent point in time,
• sending each of the respective created data delta out of the number of respective data delta, to an Internet protocol Multimedia System, IMS, node, enabling the IMS node to, upon receiving from the first device, a call invitation to the second device, enforce a policy relating to categorizing a type of communication of the call to establish a trust level associated with the first device, which enforcing is to be based on whether a data delta relating to the first device is obtained among the number of obtained data delta relating to the number of devices;
• and
• for each respective device out of the number of devices, receiving from the IMS node, a request for said data delta, which request for data delta comprises a cursor pointing out a data delta that was sent to the IMS node at said time that is earlier than the subsequent point in time;
• wherein each created data delta out of the number of created data delta relating to the subsequent point in time, is created based on the respective cursor;
• wherein the number of respective created data delta is sent to the IMS node at subsequent time intervals.

An Internet protocol Multimedia System, IMS, node, configured to handle categorization data associated to a first device in an incoming call invitation from the first device to a second device in a communications network, the IMS node further being configured to:

• obtain from the server node, a number of respective data delta, each data delta is adapted to be related to a respective device out of a number of devices at a respective subsequent point in time, which respective data delta is adapted to comprise only categorization data that is updated compared to categorization data related to a point in time that is earlier than the subsequent point in time,
• upon receiving from the first device, a call invitation to the second device, enforce a policy related to categorizing the type of communication of the call, to establish a trust level adapted to be associated with the first device, which enforcing is adapted to be based on whether a data delta relating to the first device is obtained among the number of obtained data delta adapted to be related to the number of devices;
• for each respective device out of the number of devices, send to the server node, a request for said data delta, which request for data delta is adapted to comprise a cursor pointing out a data delta that was obtained from the server node, at said time that is earlier than the subsequent point in time, wherein each of the obtained data delta out of the number of data delta related to the subsequent point in time, is adapted to be created based on the respective cursor;
• and
• upon receiving the call invitation to the called device, check in the database whether a data delta relating to the first device is obtained among the number of obtained data delta relating to the number of devices, wherein the enforcing of the policy is based on said checking of the database.