Communications

• US 7,830,894 B2
• Filed: 07/29/2004
• Issued: 11/09/2010
• Est. Priority Date: 10/30/2003
• Status: Expired due to Fees

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Bouat, Sebastien
• Primary Examiner(s): Kumar; Pankaj
• Assistant Examiner(s): SWEET, LONNIE V
• Application Number:
  US10/901,379
• Publication Number:
  US 20050094625A1
• Time in Patent Office: 2,294 Days
• Field of Search: 370/338, 370/401, 370/522, 370/352, 370/356, 370/493, 370/466, 370/467, 370/264, 370/348
• US Class Current: 370/401
• CPC Class Codes: H04W 84/08 Trunked mobile radio systems

Abstract

According to an embodiment of the present invention, there is provided a system for establishing a connection between a first and a second communication device. The first communication device supports separate voice and data channels and is arranged for sending a pair of a first and second establishment requests, the first request being sent via the data channel and the second request being sent via the voice channel. The system comprises a proxy for receiving the first request via the data channel, and a gateway for receiving the second request via the voice channel. The gateway is arranged to forward the received request to the proxy and the proxy is arranged to forward the earliest received request of the pair of requests to one of a plurality of call control servers for processing.

Claims

1. A system configured to establish a connection between a first and a second communication device, the first communication device configured to support separate voice and data channels, and further configured to send a pair of a first and second establishment requests, the first request being sent via the data channel and the second request being sent via a signaling channel associated with the voice channel, the system comprising:

a proxy configured to receive the first establishment request;

a gateway configured to receive the second establishment request, the gateway configured to forward the received second establishment request to the proxy, wherein the proxy is configured to only forward the earliest received establishment request of the pair of requests to a selected one of a plurality of call control servers; and

an authorization module configured to give authorization to the proxy to forward the earliest received establishment request of the pair of requests to the selected call control server.

2. The system of claim 1, wherein the connection is an Internet protocol (IP) connection.

3. The system of claim 1, wherein the data channel is a packet data channel.

4. The system of claim 1, wherein the first establishment request is sent in a first format, and the second establishment request is sent in a second format.

5. The system of claim 1, wherein the gateway is further configured to convert the received second establishment request into the first format prior to forwarding the converted establishment request to the proxy.

6. The system of claim 1, wherein the selected call control server is configured to establish the IP connection with the second communication device.

7. The system of claim 1, wherein the first establishment request is a session initiation protocol (SIP) message.

8. The system of claim 1, wherein the second establishment request is a session initiation protocol (SIP) message encapsulated in a short message system (SMS) format.

9. The system of claim 1, wherein the gateway is configured to ignore any establishment requests received a predetermined length of time after the transmission of the received message.

10. The system of claim 9, wherein the predetermined length of time is less than or equal to 32 seconds.

11. The system of claim 1, wherein the data channel is a code division multiple access (CDMA) packet data channel.

12. The system of claim 1, wherein the voice channel is a code division multiple access (CDMA) voice channel.

13. A push-to-talk service using a system in accordance with claim 1.

14. A method of establishing a connection between a first and a second communication device, the first communication device supporting separate voice and data channels, the method comprising:

sending, from the first communication device, a first connection establishment request via the data channel and a second connection establishment request via a signaling channel associated with the voice channel;

receiving the first connection establishment request at a proxy;

receiving the second connection establishment request at a gateway;

forwarding the second connection establishment request from the gateway to the proxy;

obtaining, at the proxy, authorization to forward the earliest received connection establishment request of the pair of requests to a call control server; and

forwarding only the earliest connection establishment request of the pair of requests received at the proxy to a selected one of a plurality of call control servers.

15. The method of claim 14, wherein the connection is an Internet protocol (IP) connection.

16. The method of claim 14, wherein the sending the first connection establishment request and the second connection establishment request comprises sending the first connection establishment request in a first format, and sending the second connection establishment request in a second format.

17. The method of claim 14, further comprising converting, at the gateway, the received second connection establishment request into the first format prior to forwarding the converted connection establishment request to the proxy.

18. The method of claim 14, further comprising establishing, through the selected call control server, the IP connection with the second communication device.

19. The method of claim 14, wherein the first connection establishment request is a session initiation protocol (SIP) message.

20. The method of claim 14, wherein the second connection establishment request is a session initiation protocol (SIP) message encapsulated in a short message system (SMS) format.

21. The method of claim 14, further comprising ignoring, at the gateway, any connection establishment requests received a predetermined length of time after the transmission of the received message.

22. The method of claim 14, wherein the data channel is a code division multiple access (CDMA) packet data channel.

23. The method of claim 14, wherein the voice channel is a code division multiple access (CDMA) voice channel.

24. A push-to-talk service operating in accordance with claim 14.