SIP service method in a network having a NAT

• US 20040139230A1
• Filed: 12/23/2003
• Published: 07/15/2004
• Est. Priority Date: 12/27/2002
• Status: Abandoned Application

• Current Assignee: LG Nortel Company Limited (Telefonaktiebolaget LM Ericsson)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Seon Keon
• Application Number:
  US10/743,301
• Publication Number:
  US 20040139230A1
• Time in Patent Office: Days
• US Class Current: 709/245
• CPC Class Codes: G06F 21/305 by remotely controlling device operation
• CPC Class Codes: G06F 21/6209 to a single file or object, e.g. in a secure envelope, encrypted and accessed using a key, or with access control rules appended to the object itself
• CPC Class Codes: G06F 21/74 operating in dual or compartmented mode, i.e. at least one secure mode
• CPC Class Codes: G06F 21/88 Detecting or preventing theft or loss
• CPC Class Codes: G06F 2221/2105 Dual mode as a secondary aspect
• CPC Class Codes: G06F 2221/2115 Third party
• CPC Class Codes: G11B 20/10009 Improvement or modification of read or write signals
• CPC Class Codes: G11B 20/10425 by counting out-of-lock events of a PLL
• CPC Class Codes: G11B 20/22 for reducing distortions
• CPC Class Codes: H03L 7/091 the phase or frequency detector using a sampling device H03L7/087 takes precedence
• CPC Class Codes: H03M 13/23 using convolutional codes, e.g. unit memory codes
• CPC Class Codes: H03M 13/2903 Methods and arrangements specifically for encoding, e.g. parallel encoding of a plurality of constituent codes
• CPC Class Codes: H03M 13/2993 Implementing the return to a predetermined state, i.e. trellis termination
• CPC Class Codes: H03M 13/6356 by repetition or insertion of dummy data, i.e. rate reduction
• CPC Class Codes: H03M 13/6362 by puncturing
• CPC Class Codes: H03M 7/4006 Conversion to or from arithmetic code
• CPC Class Codes: H04B 10/25754 Star network topology
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence
• CPC Class Codes: H04J 13/0077 Multicode, e.g. multiple codes assigned to one user
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04L 1/0066 : Parallel concatenated codes
• CPC Class Codes: H04L 1/0068 : by puncturing
• CPC Class Codes: H04L 12/4641 : Virtual LANs, VLANs, e.g. virtual private networks [VPN] LAN interconnection over a bridge based backbone H04L12/462; encapsulation techniques H04L12/4633; routing of packets H04L45/00; packet switches H04L49/00; virtual private networks for security H04L63/0272
• CPC Class Codes: H04L 25/03038 : with a non-recursive structure H04L25/03031 takes precedence
• CPC Class Codes: H04L 25/4902 : Pulse width modulation; Pulse position modulation
• CPC Class Codes: H04L 25/4904 : using self-synchronising codes, e.g. split-phase codes
• CPC Class Codes: H04L 25/497 : by correlative coding, e.g. partial response coding or echo modulation coding transmitters and receivers for partial response systems transversal equalizers at the transmitter end H04L25/03343
• CPC Class Codes: H04L 27/156 : with demodulation using temporal properties of the received signal, e.g. detecting pulse width
• CPC Class Codes: H04L 41/06 : Management of faults, events, alarms or notifications
• CPC Class Codes: H04L 43/0829 : Packet loss
• CPC Class Codes: H04L 47/15 : in relation to multipoint traffic arrangements for broadcast or multicast in data networks H04L12/18
• CPC Class Codes: H04L 47/70 : Admission control; Resource allocation
• CPC Class Codes: H04L 47/72 : using reservation actions during connection setup
• CPC Class Codes: H04L 47/745 : Reaction in network
• CPC Class Codes: H04L 47/765 : triggered by the end-points
• CPC Class Codes: H04L 47/822 : Collecting or measuring resource availability data
• CPC Class Codes: H04L 47/824 : Applicable to portable or mobile terminals
• CPC Class Codes: H04L 51/04 : Real-time or near real-time messaging, e.g. instant messaging [IM]
• CPC Class Codes: H04L 51/48 : Message addressing, e.g. address format or anonymous messages, aliases
• CPC Class Codes: H04L 51/58 : Message adaptation for wireless communication
• CPC Class Codes: H04L 61/2553 : Binding renewal aspects, e.g. using keep-alive messages
• CPC Class Codes: H04L 65/1016 : IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/1043 : Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
• CPC Class Codes: H04L 65/1101 : Session protocols
• CPC Class Codes: H04L 65/1104 : Session initiation protocol [SIP]
• CPC Class Codes: H04L 9/085 : Secret sharing or secret splitting, e.g. threshold schemes
• CPC Class Codes: H04L 9/304 : based on error correction codes, e.g. McEliece
• CPC Class Codes: H04M 1/72415 : for remote control of appliances
• CPC Class Codes: H04M 3/42221 : Conversation recording systems at the subscriber's set H04M1/656
• CPC Class Codes: H04M 7/1295 : Details of dual tone multiple frequency signalling
• CPC Class Codes: H04N 19/109 : among a plurality of temporal predictive coding modes
• CPC Class Codes: H04N 19/139 : Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
• CPC Class Codes: H04N 19/625 : using discrete cosine transform [DCT]
• CPC Class Codes: H04N 19/91 : Entropy coding, e.g. variable length coding [VLC] or arithmetic coding
• CPC Class Codes: H04W 28/00 : Network traffic management; Network resource management
• CPC Class Codes: H04W 28/18 : Negotiating wireless communication parameters
• CPC Class Codes: H04W 28/26 : Resource reservation
• CPC Class Codes: H04W 4/12 : Messaging; Mailboxes; Announcements
• CPC Class Codes: H04W 4/14 : Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
• CPC Class Codes: H04W 40/00 : Communication routing or communication path finding
• CPC Class Codes: H04W 52/30 : using constraints in the total amount of available transmission power
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/12 : Setup of transport tunnels
• CPC Class Codes: H04W 8/245 : from a network towards a terminal
• CPC Class Codes: H04W 8/26 : Network addressing or numbering for mobility support
• CPC Class Codes: H04W 88/085 : Access point devices with remote components
• CPC Class Codes: H04W 88/16 : Gateway arrangements
• CPC Class Codes: Y10S 370/906 : Fiber data distribution interface, FDDI
• CPC Class Codes: Y10S 370/907 : Synchronous optical network, SONET

Abstract

An SIP service method is provided in a network having a NAT. Private address/port of a proxy within the NAT may be registered in a static mapping table of the NAT for accessing the proxy within the NAT from outside the NAT. If messages come to the public IP address/port of the NAT mapped to the private IP address/port of the proxy, all SIP messages may be automatically transmitted to the private IP address/port of the proxy mapped to the public address. If the proxy intends to transmit messages to outside the NAT, a connection is made at the NAT to the outside using the public IP address/port mapped to the private IP address/port of the proxy.

Claims

1. A Session Initiation Protocol (SIP) service method comprising:

registering a private Internet Protocol (IP) address/port of a proxy in a static mapping table of a Network Address Transition (NAT), the private IP address/port for accessing the proxy from outside the NAT; and

upon messages coming to a public IP address/port of the NAT mapped to the private IP address/port, transmitting all SIP messages to the private IP address/port.

2. The method of claim 1, further comprising connecting to outside of the NAT using the public IP address/port if the proxy intends to transmit messages to the outside of the NAT.

3. The method of claim 2, wherein connecting to the outside comprises adding via headers to the SIP messages.

4. The method of claim 3, wherein connecting to the outside further comprises registering the public IP address port in parameters of the via headers.

5. The method of claim 4, wherein the public IP address/port is registered in the via headers without registering the proxy'"'"'s private IP address/port in the via headers.

6. The method of claim 4, wherein connecting to the outside further comprises transmitting the messages to the outside of the NAT.

7. A Session Initiation Protocol (SIP) service method comprising:

sending a SIP invite message from a first user agent to a first proxy registered in a static mapping table of a Network Address Translation (NAT) located within a same domain as the first user agent;

storing multiple public access information at a Real Time Protocol (RTP) relay located outside of domains for media processing;

changing, at the first proxy, private access information within a Session Description Protocol (SDP) message received from the first user agent to one of the multiple public access information; and

sending the SIP invite message to a second user agent through a second proxy registered in the static mapping table of another NAT.

8. The method of claim 7, further comprising:

sending a response message corresponding to the SIP invite message from the second user agent to the first proxy through the second proxy, the second proxy located within the same NAT as the second user agent.

9. The method of claim 8, further comprising:

modifying the private access information value within the SDP message to one of the multiple public access information stored at the RTP relay and sending the response message to the first user agent.

10. The method of claim 9, further comprising:

sending specific media to the modified public access information value within the invite message or the response message and thereby creating the NAT binding values, and mapping the created NAT binding values to the multiple public access information values that were stored at the RTP relay.

11. The method of claim 10, further comprising enabling the two user agents to transmit and receive media to and from each other using the stored public access information and the mapped NAT binding values.

12. The method of claim 11, wherein the public access information and the mapped NAT binding values are stored in the RTP relay.

13. The method of claim 10, further comprising:

upon receipt of the response message, sending an acknowledgment message from the first user agent.

14. The method of claim 13, wherein after the first user agent'"'"'s receipt of the response message, the method further comprises:

storing at the RTP relay NAT source access information generated during the RTP packet'"'"'s passage through the NAT, deeming the source access information as the external representation value for the first user agent'"'"'s media transmission and transmitting all RTP data received from the second user agent to the source access information.

15. The method of claim 13, further comprising:

after the second user agent'"'"'s transmission of the response message, transmitting the media from the second user agent, storing the NAT source access information at the RTP relay, and transmitting the RTP data received from the first user agent to the NAT source access information.

16. The method of claim 7, wherein if a media path is established between the two user agents for transmission and receipt of media stream, periodically transmitting keep alive messages in order to maintain the established binding.

17. The method of claim 7, further comprising:

if the first proxy receives a bye message from the first user agent, transmitting the bye message to the RTP relay; and

deleting binding values for all the relevant calls created at the RTP relay and thus terminating the call.

18. The method of claim 15, wherein the user agent'"'"'s port for transmitting the media is the same as its port for receiving the media.

19. A Session Initiation Protocol (SIP) method comprising:

providing a private address/port of a proxy within a static mapping table; and

transmitting SIP messages to the private address/port of the proxy when messages are provided to the network.

20. The method of claim 19, further comprising connecting the network to outside of the network using a public address/port.

21. The method of claim 20, wherein connecting to the outside comprises adding via headers to the SIP messages.

22. The method of claim 21, wherein connecting to the outside further comprises registering the public IP address port in parameters of the via headers.

23. The method of claim 22, wherein the public IP address/port is registered in the via headers without registering the proxy'"'"'s private IP address/port in the via headers.

24. The method of claim 22, wherein connection to the outside further comprises transmitting the messages to the outside of a Network Address Transition (NAT) of the network.

25. A Session Initiation Protocol method comprising:

sending a SIP invite message from a first user agent to a first proxy registered in a static mapping table associated with a first domain;

storing public access information at a Real Time Protocol relay;

modifying a Session Description Protocol (SDP) message to include public access information; and

sending the SIP invite message from a second proxy to a second user agent, the second proxy being registered in a static mapping table associated with a second domain.

26. The method of claim 25, further comprising:

sending a response message corresponding to the SIP invite message from the second user agent to the first proxy through the second proxy, the second proxy located within the same NAT as the second user agent.

27. The method of claim 26, wherein modifying the SDP message comprises modifying private access information value within the SDP message to one of the multiple public access information stored at the RTP relay and sending the response message to the first user agent.

28. The method of claim 27, further comprising:

sending specific media to the modified public access information value within the invite message or the response message and thereby creating the NAT binding values, and mapping the created NAT binding values to the multiple public access information values stored at the RTP relay.

29. The method of claim 28, further comprising:

upon receipt of the response message, sending an acknowledgment message from the first user agent.