Method for establishing a telecommunication connection in a telecommunication system and telecommunication system

A non-transitory computer readable storage medium containing instructions that are executable by at least one of a server and a terminal in a communications system having a network and multiple switching nodes with a respective local server and associated terminals located within the network as well as a central Direct Station Selection (DSS) server for controlling the telecommunication system by using a general switching protocol, wherein the terminals of each switching node are controlled by the local server of the switching node under a local protocol having control commands for node-internal call pickup between terminals registered inside the switching node for call pickup, and wherein the telecommunication connection is establishable by a call pickup through a second terminal of a call directed from a third terminal to a first terminal, wherein control commands provided in the local protocol for call pickup are transferred to the general switching protocol and provided across nodes to switching nodes located inside the network by the central DSS server, the instructions defining a method implemented by the server or the terminal that executes the instructions stored in the non-transitory computer readable storage media, the method comprising:

• assigning the first terminal of a first subscriber to a first switching node and assigning the second terminal of a second subscriber to another, second switching node,
• checking during registration of the first terminal for a call pickup by the second terminal to see whether the second terminal is assigned to the same switching node, and, upon a determination that this is not the case, registering the second terminal at the central DSS server using the general switching protocol;
• registering the second terminal for a call number of the first terminal such that the second switching node forwards a registration of the second terminal to the central DSS server such that the call directed from the third terminal to the first terminal is answerable at the second terminal by the second subscriber via the DSS server as a result of the registering of the second terminal, wherein the registration of the second terminal provided in the local protocol for call pickup is transferred into the general switching protocol and forwarded to the central DSS server for registering the second terminal with the DSS server;
• after the second terminal is registered with the DSS server, answering the call directed from the third terminal to the first terminal via a pickup of the call at the second terminal such that the call is picked up by the second terminal instead of the first terminal via use of the general switching protocol while other call legs for the call pickup are not taken into account in the directing of the pickup of the call at the second terminal.

A telecommunication system comprising:

• multiple switching nodes, each switching node having a respective local server and associated terminals arranged in a network, the switching nodes comprising a first switching node and a second switching node, a first terminal of a first subscriber assigned to the first switching node and a second terminal of a second subscriber assigned to the second switching node;
• and
• a central Direct Station Selection (DSS) server for controlling the telecommunication system using a general switching protocol,
• wherein terminals of a switching node are controlled by the local server of that switching node using a local protocol comprising control commands for node-internal call pickup between terminals registered within the switching node for call pickup,
• the central DSS server and the multiple switching nodes being located within the network and are provided to transfer the control commands provided in a local protocol for picking up calls in the general switching protocol and providing them to the multiple switching nodes located across nodes within the network through the central DSS server via registration of a terminal provided in the local protocol for call pickup being transferred into the general switching protocol and forwarded to the central DSS server such that a telecommunication connection for a call directed from a third terminal of a third subscriber to the first terminal assigned to the first switching node is establishable at the second terminal instead of the first terminal via a pickup of the call at the second terminal via the central DSS server responding to detection of the call by adding a call leg to the call to place the call onto the second switching node while other call legs for the call pickup are not taken into account based on a prior registration of the second terminal with the central DSS server;
• prior registration of the second terminal being provided via a registration at the central DSS server using the general switching protocol, wherein the prior registration of the second terminal is provided in the local protocol for call pickup and transferred into the general switching protocol and forwarded to the central DSS server;
• and
• the local server of the first switching node configured to check during registration of the first terminal for a call pickup by the second terminal to see whether the second terminal is assigned to the same switching node, and, upon a determination that this is not the case, the local server of the first switching node performing the registering of the second terminal at the central DSS server using the general switching protocol.