Deep dive into Kernel

List subscribe 는 budy list 에 대한 상태를 체크할 수 있다. SIP 예제 SIP body 에 budy 의 sip URI를 넣으면 된다. SUBSCRIBE sip:+9991100010006@example.com SIP/2.0^MVia: SIP/2.0/TLS 172.30.0.73:8002;branch=z9hG4bKaQBbJW1bQrVw0ehR^MMax-Forwards: 70^MCall-ID: load-a1-c0-14-X9jBj6lpQaHIPeRfJbr78SUqOSm10Fe5@172.30.0.73:8002^MFrom: ;tag=eSsdknTghrSgMBPv^MTo: ^MCSeq: 1 SUBSCRIBE^MContact: ^MEvent: presence^MExpires: 30^MAccept:..

Receiver 가 MSRP 메시지를 받음MSRP 8UH1zZt9n7ei SEND^MTo-Path: msrps://172.30.0.190:9/tKSB125985000004;tcp^MFrom-Path: msrps://sbc.example.com:1234/wibD3206000022;tcp^MMessage-ID: yZCoXV2Qz15jtKWC3KOP7OMCVu8NJpC3^MSuccess-Report: no^MFailure-Report: yes^MByte-Range: 1-345/345^MContent-Type: message/cpim^M^MFrom: ^MTo: ^MNS: imdn ^Mimdn.Message-ID: TdemiCVxBjH8a2hsxGPOeC9W192h0q7R^MDateTime: 2018-05-15T..

Dialog : a peer-to-peer SIP relationship between two user agents that persists for some time. - A dialog is identified at each UA with a dialog ID, which consists of a Call-ID value, a local tag and a remote tag. Dialog = {Call-ID + local tag + remote tag}

주요 파일파일명 기능 주요함수 receive.c socket에서 패킷을 받아서 처리 receive_msg( ) parser/msg_parser.c socket 에서 받은 패킷에 대해서 SIP protocol 파싱 parse_msg( ) parser/parse_fline.c SIP msg 에서 첫줄을 파싱하여 Req/Res 인지 파악 parse_first_line( ) file: receive.c /*! \note WARNING: buf must be 0 terminated (buf[len]=0) or some things might * break (e.g.: modules/textops) */int receive_msg(char* buf, unsigned int len, struct receive_inf..

주요 구조체 struct msg_start { int type; /* Type of the Message - Request/Response */ int len; /* length including delimiter */ union { struct { str method; /* Method string */ str uri; /* Request URI */ str version; /* SIP version */ int method_value; } request; struct { str version; /* SIP version */ str status; /* Reply status */ str reason; /* Reply reason phrase */ unsigned int /* statusclass,*/..