SYSTEMS, METHODS, AND COMPUTER PROGRAM PRODUCTS FOR PROVIDING A MANUAL RING-DOWN COMMUNICATION LINE USING SESSION INITIATION PROTOCOL

• US 20110075653A1
• Filed: 09/29/2009
• Published: 03/31/2011
• Est. Priority Date: 09/29/2009
• Status: Active Grant

• Current Assignee: IPC Systems Incorporated (Silver Lake Management Co. LLC)
• Original Assignee: IPC Systems Incorporated (Silver Lake Management Co. LLC)
• Inventors: Jain, Rajnish, Papadopoulos, Leonidas P., Potts, Timothy
• Granted Patent: US 8,599,834 B2
• Time in Patent Office: Days
• US Class Current: 370/352
• CPC Class Codes: H04L 65/1045 Proxies, e.g. for session initiation protocol [SIP]
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42

Abstract

Systems, methods, and computer program products are provided for manual ring-down communication using Session Initiation Protocol (SIP). A first SIP user agent transmits a message to a second SIP user agent over an Internet Protocol (IP) network to establish a SIP session. The first SIP user agent determines that a signal key associated with a first communication device has been selected and transmits, to the second SIP user agent over the IP network, a start event message to cause a second communication device to activate an alert. The first SIP user agent determines that the signal key has been released and transmits over the IP network an end event message to deactivate the alert. The first SIP user agent transmits, to the second SIP user agent over the IP network, one or more subsequent INVITE messages at a predetermined repetition rate to refresh the SIP session.

Claims

1. A method for providing a manual ring-down communication line using Session Initiation Protocol (SIP), comprising the steps of:

transmitting, by a first SIP user agent to a second SIP user agent over an Internet Protocol (IP) network, an INVITE message to establish a SIP session;

determining, by the first SIP user agent, that a signal key associated with a first communication device has been selected;

transmitting, by the first SIP user agent to the second SIP user agent over the IP network, a start event message to cause a second communication device to activate an alert;

determining, by the first SIP user agent, that the signal key associated with the first communication device has been released; and

transmitting, by the first SIP user agent to the second SIP user agent over the IP network, an end event message to cause the second communication device to deactivate the alert.

2. The method of claim 1, wherein the alert is at least one of an audible alert and a visual alert.

3. The method of claim 1, further comprising transmitting, by the first SIP user agent to the second SIP user agent over the IP network, a session establisher message to dynamically negotiate a role of session establisher between the first SIP user agent and the second SIP user agent.

4. The method of claim 3, wherein the session establisher message is an OPTIONS message.

5. The method of claim 1, further comprising forwarding, by at least one of a SIP proxy and a back-to-back user agent (B2BUA), a message between the first SIP user agent and the second SIP user agent over the IP network.

6. A computer-readable medium having stored thereon sequences of instructions, the sequences of instructions including instructions, which, when executed by a computer system, cause the computer system to:

transmit, by a first SIP user agent to a second SIP user agent over an Internet Protocol (IP) network, an INVITE message to establish a SIP session;

determine, by the first SIP user agent, that a signal key associated with a first communication device has been selected;

transmit, by the first SIP user agent to the second SIP user agent over the IP network, a start event message to cause a second communication device to activate an alert;

determine, by the first SIP user agent, that the signal key associated with the first communication device has been released; and

transmit, by the first SIP user agent to the second SIP user agent over the IP network, an end event message to cause the second communication device to deactivate the alert.

7. The computer-readable medium of claim 6, wherein the alert is at least one of an audible alert and a visual alert.

8. The computer-readable medium of claim 6, wherein the instructions, when executed by the computer system, further cause the computer system to transmit, by the first SIP user agent to the second SIP user agent over the IP network, an OPTIONS message to dynamically negotiate a role of session establisher between the first SIP user agent and the second SIP user agent.

9. The computer-readable medium of claim 8, wherein the session establisher message is an OPTIONS message.

10. The computer-readable medium of claim 6, wherein the instructions, when executed by the computer system, further cause the computer system to forward, by at least one of a SIP proxy and a back-to-back user agent (B2BUA), a message between the first SIP user agent and the second SIP user agent over the IP network.

11. A manual ring-down private line communication system, the system comprising:

a first SIP user agent communicatively coupled to an IP network, wherein the first SIP user agent is configured to;

transmit, over the IP network, an INVITE message to establish a Session Initiation Protocol (SIP) session;

determine that a signal key associated with a first communication device has been selected;

transmit, over the IP network, a start event message to cause a second communication device to activate an alert;

determine that the signal key associated with the first communication device has been released; and

transmit, over the IP network, an end event message to cause the second communication device to deactivate the alert; and

a second SIP user agent communicatively coupled to the IP network, wherein the second SIP user agent is configured to receive, over the IP network, the INVITE message, the start event message, and the end event message.

12. The system of claim 11, wherein the alert is at least one of an audible alert and a visual alert.

13. The system of claim 11, wherein the first SIP user agent is further configured to transmit, to the second SIP user agent over the IP network, a session establisher message to dynamically negotiate a role of session establisher between the first SIP user agent and the second SIP user agent.

14. The system of claim 13, wherein the session establisher message is an OPTIONS message.

15. The system of claim 11, further comprising at least one of a SIP proxy and a back-to-back user agent (B2BUA) configured to forward a message between the first SIP user agent and the second SIP user agent over the IP network.

16. A method of negotiating a Session Initiation Protocol (SIP) session establisher, comprising:

transmitting, by a first SIP user agent to a second SIP user agent over an Internet Protocol (IP) network, an OPTIONS message to request designation of a session establisher, wherein the OPTIONS message includes an identifier of the first SIP user agent; and

receiving, by the first SIP user agent from the second SIP user agent over the IP network, a 200 OK message accepting designation of the first SIP user agent as the session establisher.