Application control at a policy server
A packet-based communication system comprises first and second endpoints, an application manager and a policy server. When establishing a connection between the endpoints the application manager sends, to the policy server, application control related information about the required connection. The policy server then selects at least one application control parameter, such as a codec to be used by the endpoints, and returns this information to the application manager. The application control information can be carried between the application manager and policy server by an application control protocol, such as the Session Initiation Protocol (SIP), or by modified forms of policy control protocols such as the Common Open Policy Service (COPS), Diameter, SOAP/XML or Parlay.
1 . A method of establishing a connection between first and second endpoints in a packet-based communication system which comprises an application manager and a policy server, the method comprising, at the application manager:
receiving information about the required connection;
sending, to the policy server, application control related information for the required connection;
receiving, from the policy server, at least one application control parameter selected by the policy server.
2 . A method according to claim 1 wherein the application control related information sent to the policy server comprises the set of codecs supported by the first and second endpoints and the application control parameter received from the policy server comprises a selected codec to be used by the endpoints.
3 . A method according to claim 2 wherein the connection between endpoints comprises a plurality of related flows, the application control related information comprises information for each of the plurality of flows.
4 . A method according to claim 3 wherein the application control parameter received from the policy server is based on the plurality of flows.
5 . A method according to claim 1 wherein the application control related information sent to the policy server includes address/port information.
6 . A method according to claim 5 wherein the application control parameter received from the policy server includes media proxy information based on the supplied address/port information.
7 . A method according to claim 1 wherein the system further comprises at least one policy enforcement point (PEP) and the application control parameter received from the policy server is based on an interaction between the policy server and at least one PEP.
8 . A method according to claim 1 wherein the application control related information further comprises at least one of: required bandwidth, QoS and class of service.
9 . A method according to claim 1 wherein the application control information is sent using Session Initiation Protocol (SIP).
10 . A method according to claim 1 wherein the application control information is sent using a modified form of one of: Common Open Policy Service (COPS), Diameter, SOAP/XML and Parlay.
11 . A method according to claim 1 wherein the application control parameter is received using a modified form of one of: Common Open Policy Service (COPS), Diameter, SOAP/XML and Parlay.
12 . A method of establishing a connection between first and second endpoints in a packet-based communication system which comprises an application manager and a policy control function, the method comprising, at the policy server:
receiving application control related information for the required connection from the application manager;
selecting at least one application control parameter for the required connection; and,
sending, to the application manager, the selected application control parameter.
13 . A method according to claim 12 wherein the application control related information received from the application manager comprises the set of codecs supported by the first and second endpoints and the selected application control parameter comprises a selected codec to be used by the endpoints.
14 . A method according to claim 13 wherein the connection between endpoints comprises a plurality of related flows, the application control related information comprises information for each of the plurality of flows.
15 . A method according to claim 14 wherein the selected application control parameter is based on the plurality of flows.
16 . A method according to claim 12 wherein the application control related information received from the application manager includes address/port information.
17 . A method according to claim 16 wherein the selected application control parameter includes media proxy information based on the supplied address/port information.
18 . A method according to claim 12 wherein the system further comprises at least one policy enforcement point (PEP) and the selected application control parameter is based on an interaction between the policy server and at least one PEP.
19 . A method according to claim 12 wherein the application control related information further comprises at least one of: required bandwidth, QoS and class of service.
20 . A method according to claim 12 wherein the application control parameter is sent using Session Initiation Protocol (SIP).
21 . A method according to claim 12 wherein the application control information is received using a modified form of one of: Common Open Policy Service (COPS), Diameter, SOAP/XML and Parlay.
22 . A method according to claim 12 wherein the application control parameter is sent using a modified form of one of: Common Open Policy Service (COPS), Diameter, SOAP/XML and Parlay.
23 . An application manager for use as part of a packet-based communication system which comprises first and second endpoints and a policy server, the application manager being operable to:
receive information about a required connection between the first and second endpoints;
send, to the policy server, application control related information for the required connection;
receive, from the policy server, at least one application control parameter selected by the policy server.
24 . A policy server for use as part of a packet-based communication system which comprises first and second endpoints and an application manager, the policy server being operable to:
receive application control related information for a required connection between the first and second endpoints from the application manager;
select at least one application control parameter for the required connection; and, send, to the application manager, the selected application control parameter.
25 . A computer program product comprising instructions for causing a control entity of an application manager in a packet-based communication system which comprises first and second endpoints and a policy server to:
receive information about a required connection between the first and second endpoints;
send, to the policy server, application control related information for the required connection;
receive, from the policy server, at least one application control parameter selected by the policy server.
26 . A computer program product comprising instructions for causing a control entity of a policy server in a packet-based communication system which comprises first and second endpoints and an application manager to:
receive application control related information for a required connection between the first and second endpoints from the application manager;
select at least one application control parameter for the required connection; and, send, to the application manager, the selected application control parameter.
27 . A signal for use within a packet-based communication system comprising first and second endpoints, the signal having a format complying with a policy control protocol, the signal further carrying application control related information about a required connection between the first and second endpoints of the system.
28 . A signal according to claim 27 wherein the connection between the first and second endpoints comprises a plurality of related flows, and the application control related information comprises information for each of the plurality of flows.
29 . A signal according to claim 27 wherein the policy control protocol is one of: Common Open Policy Service (COPS), Diameter, SOAP/XML and Parlay.
30 . A signal for use within a packet-based communication system comprising first and second endpoints, the signal having a format complying with a policy control protocol, the signal further carrying at least one application control parameter for a required connection between the first and second endpoints of the system.
31 . A signal according to claim 30 wherein the policy control protocol is one of: Common Open Policy Service (COPS), Diameter, SOAP/XML and Parlay.