한국어

소프트스위치

온누리070 플레이스토어 다운로드
    acrobits softphone
     온누리 070 카카오 프러스 친구추가온누리 070 카카오 프러스 친구추가친추
     카카오톡 채팅 상담 카카오톡 채팅 상담카톡
    
     라인상담
     라인으로 공유

     페북공유

   ◎위챗 : speedseoul


  
     PAYPAL
     
     PRICE
     

pixel.gif

    before pay call 0088 from app


http://www.opensips.org/html/docs/modules/devel/tm.html



TM module enables stateful processing of SIP transactions. The main use of stateful logic, which is costly in terms of memory and CPU, is some services inherently need state. For example, transaction-based accounting (module acc) needs to process transaction state as opposed to individual messages, and any kinds of forking must be implemented statefully. Other use of stateful processing is it trading CPU caused by retransmission processing for memory. That makes however only sense if CPUconsumption per request is huge. For example, if you want to avoid costly DNS resolution for every retransmission of a request to an unresolvable destination, use stateful mode. Then, only the initial message burdens server by DNS queries, subsequent retransmissions will be dropped and will not result in more processes blocked by DNS resolution. The price is more memory consumption and higher processing latency.

From user's perspective, the major function is t_relay(). It setup transaction state, absorb retransmissions from upstream, generate downstream retransmissions and correlate replies to requests.

In general, if TM is used, it copies clones of received SIP messages in shared memory. That costs the memory and also CPUtime (memcpys, lookups, shmem locks, etc.) Note that non-TM functions operate over the received message in private memory, that means that any core operations will have no effect on statefully processed messages after creating the transactional state. For example, calling record_route after t_relay is pretty useless, as the RR is added to privately held message whereas its TMclone is being forwarded.

TM is quite big and uneasy to program--lot of mutexes, shared memory access, malloc and free, timers--you really need to be careful when you do anything. To simplify TM programming, there is the instrument of callbacks. The callback mechanisms allow programmers to register their functions to specific event. See t_hooks.h for a list of possible events.

Other things programmers may want to know is UAC--it is a very simplistic code which allows you to generate your own transactions. Particularly useful for things like NOTIFYs or IM gateways. The UAC takes care of all the transaction machinery: retransmissions , FR timeouts, forking, etc. See t_uac prototype in uac.h for more details. Who wants to see the transaction result may register for a callback.

조회 수 :
44615
등록일 :
2014.10.04
16:58:21 (*.160.88.200)
엮인글 :
http://webs.co.kr/index.php?document_srl=241853&act=trackback&key=7a5
게시글 주소 :
http://webs.co.kr/index.php?document_srl=241853
List of Articles
번호 제목 글쓴이 날짜 조회 수
108 A2Billing and OpenSIPS – Part 1 admin 2017-08-29 31092
107 A2Billing and OpenSIPS – Part 2 admin 2017-08-29 33161
106 A2Billing and OpenSIPS – Part 3 admin 2017-08-29 20450
105 OpenSIPS 2.3 philosophy admin 2017-08-17 20729
104 The timeline for OpenSIPS 2.3 is admin 2017-08-17 21025
103 OpenSIPS Control Panel and Homer integration admin 2017-08-17 42037
102 Opensips sip capture re designed admin 2017-07-16 20370
101 WebRTC with OpenSIPS WebSocket is a protocol provides full-duplex admin 2015-04-04 31980
100 WebSocket Support in OpenSIPS 2.1 admin 2015-04-04 30639
99 OpenSIPS 2.1 (rc) is available, download now! admin 2015-03-22 23735
98 Service Provision Using Asterisk & OpenSIPS - AstriCon 2014 admin 2015-02-25 32574
97 SIP Signaling-Messages OpenSIPS Running On Multicore Server file admin 2014-11-02 41240
96 opensips.cfg for Asterisk admin 2014-10-20 36556
95 A2Billing and OpenSIPS config admin 2014-10-20 37376
94 Jitsi Videobridge meets WebRTC admin 2014-10-18 44236
93 A Survey of Open Source Products for Building a SIP Communication Platform admin 2014-10-18 39288
92 Script Function , Module Index v1.11 함수 모듈 opensips admin 2014-10-14 34931
» Opensips TM module enables stateful processing of SIP transactions admin 2014-10-04 44615
90 kamailio.cfg configuration Example admin 2014-10-04 36197
89 opensips NAT Traversal Module admin 2014-10-02 36269
88 UAC Registrant Module admin 2014-09-28 38515
87 MediaProxy 2.3.x & OpenSIPS 1.5.x Integration admin 2014-08-24 39209
86 RTPPROXY Admin Guide admin 2014-08-24 40640
85 CANCEL MESSAGE not handled correctly admin 2014-08-23 38333
84 [Sipdroid] SIP data collection study tour admin 2014-08-23 38589
83 [OpenSIPS-Users] Opensips 1.10 NAT radius aaa admin 2014-08-23 35739
82 OpenSIPS Consultancy Pricing module install Server 판매 또는 설치및 컨설팅 가이드 admin 2014-08-23 40601
81 ICE: The ultimate way of beating NAT in SIP admin 2014-08-23 63810
80 Many OPENSIPS Configuration Examples This will Help you admin 2014-08-23 48219
79 Real-time Charging System for Telecom & ISP environments admin 2014-08-23 39442