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 :
44753
등록일 :
2014.10.04
16:58:21 (*.160.88.200)
엮인글 :
http://webs.co.kr/index.php?document_srl=241853&act=trackback&key=8c4
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 31230
107 A2Billing and OpenSIPS – Part 2 admin 2017-08-29 33293
106 A2Billing and OpenSIPS – Part 3 admin 2017-08-29 20576
105 OpenSIPS 2.3 philosophy admin 2017-08-17 20850
104 The timeline for OpenSIPS 2.3 is admin 2017-08-17 21161
103 OpenSIPS Control Panel and Homer integration admin 2017-08-17 42156
102 Opensips sip capture re designed admin 2017-07-16 20501
101 WebRTC with OpenSIPS WebSocket is a protocol provides full-duplex admin 2015-04-04 32114
100 WebSocket Support in OpenSIPS 2.1 admin 2015-04-04 30824
99 OpenSIPS 2.1 (rc) is available, download now! admin 2015-03-22 23868
98 Service Provision Using Asterisk & OpenSIPS - AstriCon 2014 admin 2015-02-25 32742
97 SIP Signaling-Messages OpenSIPS Running On Multicore Server file admin 2014-11-02 41354
96 opensips.cfg for Asterisk admin 2014-10-20 36679
95 A2Billing and OpenSIPS config admin 2014-10-20 37512
94 Jitsi Videobridge meets WebRTC admin 2014-10-18 44467
93 A Survey of Open Source Products for Building a SIP Communication Platform admin 2014-10-18 39404
92 Script Function , Module Index v1.11 함수 모듈 opensips admin 2014-10-14 35089
» Opensips TM module enables stateful processing of SIP transactions admin 2014-10-04 44753
90 kamailio.cfg configuration Example admin 2014-10-04 36337
89 opensips NAT Traversal Module admin 2014-10-02 36430
88 UAC Registrant Module admin 2014-09-28 38690
87 MediaProxy 2.3.x & OpenSIPS 1.5.x Integration admin 2014-08-24 39335
86 RTPPROXY Admin Guide admin 2014-08-24 40767
85 CANCEL MESSAGE not handled correctly admin 2014-08-23 38466
84 [Sipdroid] SIP data collection study tour admin 2014-08-23 38730
83 [OpenSIPS-Users] Opensips 1.10 NAT radius aaa admin 2014-08-23 35878
82 OpenSIPS Consultancy Pricing module install Server 판매 또는 설치및 컨설팅 가이드 admin 2014-08-23 40744
81 ICE: The ultimate way of beating NAT in SIP admin 2014-08-23 64008
80 Many OPENSIPS Configuration Examples This will Help you admin 2014-08-23 48384
79 Real-time Charging System for Telecom & ISP environments admin 2014-08-23 39567