Routing of sessions to other communication networks

A control node for registration of a user equipment in a first communication network;

• the control node and the user equipment being part of the first communication network;
• the control node comprising:
• one or more processing circuits configured to:
• receive a query response from a subscriber database comprising capability information characterizing capabilities required for a first control node, wherein the capability information comprises information in which geographical region of the first communication network the user equipment is located;
• select a first control node based on the received capability information, wherein the first control node is part of the first communication network and wherein, to select the first control node based on the received capability information, the one or more processing circuits are configured to select the first control node based on a proximity of the first control node to the geographical region comprised in the received capability information;
• and
• send a registration request to the first control node, wherein the registration request comprises the capability information.

A method of routing a session invitation, the method comprising:

• receiving a session invitation by a first control node in a first communication network;
• determining, by the first control node and based on a breakout condition, that routing of the session invitation requires a breakout from the first communication network to a second communication network, and sending the session invitation to a second control node that is part of the first communication network in response, wherein the second communication network is interconnected with the first communication network in at least two different geographical regions by at least one point of interconnect each;
• responsive to the determination by the first control node that the breakout is required, selecting, by the second control node and based on capability information characterizing capabilities of the first control node, one of the points of interconnect at which to breakout;
• sending the session invitation, by the second control node, toward the selected point of interconnect.

A control node in a first communication network, the control node comprising:

• one or more processing circuits configured to:
• determine, based on a breakout condition, that routing of a session invitation requires a breakout to a second communication network, wherein the second communication network is interconnected with the first communication network in at least two different geographical regions by at least one point of interconnect each;
• add capability information characterizing capabilities of the control node to the session invitation;
• responsive to determining that the breakout is required, send the session invitation, with the capability information added, to a second control node in the first communication network for further routing, relying on the second control node to determine which of the points of interconnect to use for the breakout.

A control node in a first communication network, the control node comprising:

• one or more processing circuits configured to:
• receive a session invitation from a first control node in the first communication network, the session invitation comprising capability information characterizing capabilities of the first control node and the first communication network being interconnected with a second communication network in at least two different geographical regions by at least one point of interconnect each;
• responsive to a determination by the first control node that a breakout from the first communication network to the second communication network is required in order to route the session invitation, select one of the points of interconnect at which to perform the breakout based on the capability information in the session invitation;
• send the session invitation toward the selected point of interconnect.

A system in a first communication network, the system comprising:

• a first control node and a second control node;
• wherein the first control node comprises one or more processing circuits configured to:
• determine, based on a breakout condition, that routing of a session invitation requires a breakout to a second communication network, wherein the second communication network is interconnected with the first communication network in at least two different geographical regions by at least one point of interconnect each;
• responsive to determining that the breakout is required, send the session invitation to the second control node for further routing, relying on the second control node to determine which of the points of interconnect to use for the breakout;
• wherein the second control node comprises one or more processing circuits configured to, responsive to the determination by the first control node that the breakout is required in order to route the session invitation:
• receive the session invitation from the first control node;
• select one of the points of interconnect at which to perform the breakout based on capability information characterizing capabilities of the first control node comprised in the session invitation;
• send the session invitation toward the selected point of interconnect.