KR100511479B1 - Nat를 갖는 망에서의 sip 서비스 방법 - Google Patents
Nat를 갖는 망에서의 sip 서비스 방법 Download PDFInfo
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- KR100511479B1 KR100511479B1 KR10-2002-0084994A KR20020084994A KR100511479B1 KR 100511479 B1 KR100511479 B1 KR 100511479B1 KR 20020084994 A KR20020084994 A KR 20020084994A KR 100511479 B1 KR100511479 B1 KR 100511479B1
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Abstract
Description
Claims (10)
- NAT를 갖는 망에서의 SIP 서비스에 있어서,NAT 외부에서 NAT 내부에 위치한 프록시로 접근하기 위해서 상기 NAT 내부의 프록시의 사설 IP 어드레스/포트를 NAT의 정적 매핑 테이블에 등록하는 단계;상기 프록시의 사설 IP 어드레스/포트와 매핑된 NAT의 공인 IP 어드레스/포트로 들어올 경우, NAT가 모든 SIP 메시지를 해당 공인 주소에 매핑된 상기 프록시의 사설 IP 어드레스/포트로 자동 전송하는 단계;상기 프록시가 NAT 밖으로 메시지를 전송할 경우, NAT가 프록시의 사설 IP 어드레스/포트와 매핑된 공인 IP 어드레스/포트를 가지고 외부와 연결하는 단계를 포함하는 것을 특징으로 하는 NAT를 갖는 망에서의 SIP 서비스 방법.
- 제 1항에 있어서,상기 NAT 내부의 프록시가 NAT 밖으로 메시지를 전송할 경우, 비아 헤더를 첨가하여, 비아 헤더 파라미터에 자신의 사설 IP 어드레스와 포트가 아닌 해당 NAT 정적 매핑 테이블에 등록된 공인 IP 어드레스와 포트를 등록하여 전송하는 것을 특징으로 하는 NAT를 갖는 망에서의 SIP 서비스 방법.
- 제 1사용자 에이전트가 동일 도메인에 존재하는 NAT의 정적 매핑 테이블에 등록되어 있는 제 1프록시로 제 2사용자 에이전트에 대한 SIP 초대 메시지를 보내는 단계;도메인 밖의 RTP 릴레이가 제 1프록시에 연동하여 미디어 처리를 위한 복수개의 공인 IP 어드레스/포트 페어를 생성하여 저장하는 단계;제 1프록시가 제 1사용자 에이전트로부터 받은 SDP 메시지안의 사설 연결 정보 값(IP Address/port pair)을 상기 RTP 릴레이가 생성한 복수개의 공인 정보 값 중에서 하나로 수정하여 다른 NAT의 정적 매핑 테이블에 등록된 제 2프록시를 통해 제 2사용자 에이전트에게 SIP 초대 메시지를 보내는 단계;제 2사용자 에이전트에서 상기 초대 메시지에 대한 응답 메시지를 소속 NAT 내부의 제 2프록시를 통해 제 1프록시로 응답하는 단계;제 1프록시에서 제 2사용자 에이전트의 응답 메시지를 받으면 SDP 안의 사설 연결 정보값(IP Address/port pair)을 사전에 RTP 릴레이로부터 생성된 값 중 나머지 하나의 공인 값으로 수정하여 제 1사용자 에이전트에게 보내는 단계;음성 통화로를 열기 위한 NAT 바인딩 값을 얻기 위해, 각 사용자 에이전트가 초대 또는 응답 메시지의 SDP 메시지 안의 수정된 공인 연결정보 값으로 특정 미디어를 RTP 릴레이에 전송하여 NAT 바인딩 값들을 생성하며, 상기 생성된 NAT 바인딩 값들을 RTP 릴레이에서 이전에 생성한 복수개의 공인 값들과 매핑시켜 저장하는 단계;제 1사용자 에이전트가 응답 메시지를 받은 후, 응답 메시지에 대한 인식 메시지를 전송하고 호 셋업 단계를 포함하는 것을 특징으로 하는 NAT를 갖는 망에서의 SIP 서비스 방법.
- 제 3항에 있어서, 상기 호 셋업 단계 후 RTP 릴레이가 자신이 가지고 있는 공인 연결 정보와 매핑된 NAT 바인딩 값을 이용하여 두 사용자 에이전트들이 서로 간에 미디어를 전송 및 수신할 수 있게 하는 단계를 더 포함하는 것을 특징으로 하는 NAT를 갖는 망에서의 SIP 서비스 방법.
- 제 3항에 있어서, 상기 제 1사용자 에이전트가 응답 메시지를 수신한 후 RTP 릴레이에 미디어가 전송됨에 따라,상기 RTP 릴레이에 RTP 패킷이 NAT를 통과하면서 생긴 NAT 소스 연결정보가저장 되고, 그 소스 연결 정보를 제 1사용자 에이전트의 미디어 전송을 위한 외부 대표 값으로 하여 제 2사용자 에이전트로부터 오는 모든 RTP 데이터를 상기 소스 연결 정보로 보내는 단계;제 2사용자 에이전트가 응답 메시지를 보낸 후, 미디어를 RTP 릴레이에 전송하고, RTP 릴레이에서 NAT 소스 연결정보를 저장하여 제 1사용자 에이전트로부터 오는 모든 RTP 데이터를 상기 NAT 소스 연결 정보로 보내는 단계;를 더 포함하는 것을 특징으로 하는 NAT를 갖는 망에서의 SIP 서비스 방법.
- 제 3항에 있어서, 상기 호 셋업 단계 후, 두 사용자 에이전트가 서로 간에 미디어 스트림의 전송과 수신을 하기 위한 미디어 경로가 성립되면, 성립된 바인딩을 지속적으로 활성화시켜 주기 위해 일정 시간에 한번씩 생존지속메시지를 전송하는 단계를 포함하는 것을 특징으로 하는 NAT를 갖는 망에서의 SIP 서비스 방법.
- 제 3항에 있어서, 상기 제 1사용자 에이전트로부터 제 1프록시가 바이 메시지를 받으면 RTP 릴레이에게 전달하여 RTP 릴레이에 생성되었던 모든 해당 호의 바인딩 값을 삭제하여 호를 종료하는 것을 특징으로 하는 NAT를 갖는 망에서의 SIP 서비스 방법.
- 제 3항에 있어서, 상기 NAT 방식은 풀콘, 지역제한 콘, 포트 지역제한 콘, 대칭적 콘인 것을 특징으로 하는 NAT를 갖는 망에서의 SIP 서비스 방법.
- 제 3항에 있어서, 상기 시그널링 메시지는 모두 프록시를 경유하고, 상기 사설 측에서 공인으로 나가는 모든 미디어 스트림은 RTP 릴레이를 경유하는 것을 특징으로 하는 NAT를 갖는 망에서의 SIP 서비스 방법.
- 제 3항에 있어서, 상기 사용자 에이전트에서 미디어 스트림의 송신 및 수신 포트는 같은 것을 특징으로 하는 NAT를 갖는 망에서의 SIP 서비스 방법.
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US10/743,301 US20040139230A1 (en) | 2002-12-27 | 2003-12-23 | SIP service method in a network having a NAT |
CNB2003101246176A CN100466650C (zh) | 2002-12-27 | 2003-12-25 | 具有nat的网络中的sip服务方法 |
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AU2002345633A1 (en) * | 2001-06-08 | 2002-12-23 | 4Th Pass Inc. | Method and system for two-way initiated data communication with wireless devices |
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