소프트스위치

오늘:
893
어제:
2,297
전체:
2,979,530

고객센타 : 070-7752-2000
팩스 : 070-7752-2001
휴대폰 : 010-9513-0019
email : voipkorea@yahoo.co.kr

국민은행
(주)제이에스솔루션
047101-04-155519

Flag Counter
■ 무료 : 유선 집전화 휴대폰 ( 한국 미국 중국 카나다) ↔ (국내 해외 여행자 상사 주재원 유학생) / 가입무 무제한무료■

https://blog.opensips.org/2017/03/10/advanced-sip-scenarios-with-event-based-routing/


Advanced SIP scenarios with Event-based-Routing


  • Push Notification (call and registration correlation)
  • Call Pickup (2 calls correlation)
  • DMTF/IVR call driving (call and RTP correlation)

There is an increasing need for more complex SIP scenarios, even for the Class 4 Switches. Such scenarios exceed the capabilities of a liner processing – something more powerful and flexible is needed in turns of driving the SIP routing.

The 2.1 OpenSIPS version brought a radical change in how the SIP traffic is handled – a more efficient processing and a better CPU harvesting were achieved by introducing the asynchronous (or non blocking) I/O operations.

Even if the performance and responsiveness of OpenSIPS was addressed, the handling (or processing) of the SIP messages is still linear. Once you start processing a SIP message you can do external queries (DB, REST, Exec and other), but it is limited to its own context, being unable to:

  • communicate and exchange data with the processing of a different SIP message
  • synchronize or wait for  actions related to the processing of a different SIP message

Such capabilities are essential in order to implement more complex SIP scenarios where multiple elements (calls, registrations, RTP events, B2B sessions) are involved and correlated at different moments in time. And some examples of such scenarios:

  • Push Notification (call and registration correlation)
  • Call Pickup (2 calls correlation)
  • DMTF/IVR call driving (call and RTP correlation)

and many more.

Event based Routing

This is the way of performing SIP routing via events (generated by the Event Interface).  And this is a new mechanism provided by OpenSIPS 2.3 to address complex processing problems.

But what are these events ?

  • Triggered by actions / data processing during runtime  – like a new contact is registered, a destination is marked as failed, a dialog ended – all are events;
  • The events hold key/value attributes – these attributes are describing the event and they represent the data attached to the event;
  • OpenSIPS has a list of events – the events are predefined (by modules) or custom defined in the OpenSIPS script.

Now, how are these events used to control the SIP routing ? The OpenSIPS 2.3 Event based Routing (or shortly EBR) relays on a subscriber – notify model :

  • when processing a SIP message, you can subscribe to certain events;
  • the event subscriptions may contain filtering attributes (to narrow down the interesting events);
  • when an event is raised, it is dispatched to all relevant subscribers- this is the notification part.

And finally, how does the routing part work ?

  • The subscriber waits in asynchronous  mode to receive the notification; the processing of the subscriber will suspend and it will be fully resumed when the notification is
    received.EBR_model_wait
  • The subscriber continues its processing after subscription, without any waiting. Whenever a notification is received, a script route (armed by the subscription) will be executed.EBR_model_notify

Example time – Push Notification

Scenario

Alice calls Bob. Bob has a hardphone registered, but he may also use a mobile device as SIP client. The SIP client on the mobile device is not permanently SIP registered, and it requires a Push Notification (or similar) mechanism to force its registration when there is an incoming call.

Challenges

  • we want to deliver the call right away to Bob’s hardphone, without any waiting due the PN logic.
  • we want to do parallel forking (simultaneous ringing) to Bob’s mobile, as soon as it registers (as a result of PN)
  • we want to keep the call on, even if the hardphone declines it (maybe due to DND settings) and give a chance to the PN to trigger the mobile device registration.

If we manage to address all the challenges above, we can say we have a fully flavored Push Notification implementation.

How to

When we route the call to the callee – to Bob, in our case – we need to follow these logical steps:

  1. subscribe for the event to let us know when there is a new contact registered by Bob
  2. fetch all existing registered contacts from user-location
  3. if any contacts found, send the call to the existing contacts
  4. when new contact events are notified, inject them into the call to Bob

OpenSIPS script

Here is the relevant OpenSIPS script doing the above . For a better understanding of the code and used functions, I strongly recommend to read the module documentation for the event_routing and tm modules.

route[route_to_user] {

    # prepare transaction for branch injection; it is mandatory
    # to create the transaction before the subscription, otherwise
    # the EBR module will not pass the transaction ID into the
    # notification route
    t_newtran();

    # keep the transaction alive (even if all branches will
    # terminate) until the FR INVITE timer hits (we want to wait
    # for new possible contacts being registered)
    t_wait_for_new_branches();

    # subscribe to new contact registration event, but for our callee only
    $avp(filter) = "aor="+$rU;
    notify_on_event("E_UL_CONTACT_INSERT","$avp(filter)", "fork_call", "20");

    # fetch already registered contacts and relay if any
    if (lookup("location"))
        route(relay);
    # if there were no contacts available (so no branches created so far),
    # the created transaction will still be waiting for new branches due 
    # to the usage of the t_wait_for_new_branches() function

    exit;
}

route[fork_call]  {
    xlog("user $avp(aor) registered the a new contact $avp(uri), "
        "injecting it in transaction\n");
    # take the contact described by the E_UL_CONTACT_INSERT
    # event and inject it as a new branch into the original transaction
    t_inject_branches("event");
}

Do you want to see this script in action ? We uploaded a demo recording on youtube, just for you to enjoy it <div class=이 게시물을...

조회 수 :
1547
등록일 :
2017.09.11
19:29:22 (*.160.88.18)
엮인글 :
http://webs.co.kr/index.php?document_srl=3311864&act=trackback&key=71d
게시글 주소 :
http://webs.co.kr/index.php?document_srl=3311864
List of Articles
번호 제목 글쓴이 날짜 조회 수
158 List of SIP response codes admin 2017-12-20 280
157 opensips/modules/event_routing/ Push Notification Call pickup admin 2017-12-20 250
156 opensips push notification How to detail file admin 2017-12-20 262
155 OpenSIPS routing logic admin 2017-12-12 293
154 OpenSIPS example configuration admin 2017-12-12 296
153 opensips log output admin 2017-12-11 303
152 opensips complete configuration example admin 2017-12-10 329
151 Opensips1.6 ebook detail configuration and SIP signal and NAT etc file admin 2017-12-10 355
150 dictionary.opensips radius admin 2017-12-09 590
149 what is record_route() in opensips ? admin 2017-12-09 576
148 what is loose_route() in opensips ? file admin 2017-12-09 603
147 in opensips what is lookup(domain [, flags [, aor]]) admin 2017-12-09 609
146 in opensips db_does_uri_exist() what is admin 2017-12-09 580
145 in opensips what is has_totag() admin 2017-12-09 602
144 opensips exec module admin 2017-12-08 635
143 opensips push notification How to admin 2017-12-07 594
142 OpenSIPS Module Interface admin 2017-12-07 612
141 opensips configuration config explain easy basic 오픈쉽스 컨피그레이션 기본 설명 file admin 2017-12-07 628
140 openssl 을 이용한 인증서 생성 절차를 정리한다. 개인키 CSR SSL 인증서 파일 생성 admin 2017-09-14 1506
139 Documentation -> Tutorials -> TLS opensips.cfg admin 2017-09-14 1539
138 Using TLS in OpenSIPS v2.2.x admin 2017-09-14 1489
137 opensips tls cfg admin 2017-09-14 1565
136 How to setup a Jabber / XMPP server on Debian 8 (jessie) using ejabberd admin 2017-09-13 1575
135 SIP to XMPP Gateway + SIP Presence Server opensips admin 2017-09-13 1497
134 OpenSIPS command line tricks admin 2017-09-13 1492
133 Fail2Ban Freeswitch How to secure admin 2017-09-12 1560
132 opensips.cfg. sample admin 2017-09-12 1499
» Advanced SIP scenarios with Event-based-Routing admin 2017-09-11 1547
130 PUSH SERVER 푸시서버 안드로이드 애플 admin 2017-09-11 1551
129 오픈소스 (사내)메신저 서버 구축, 오픈 파이어(openfire) 설치방법과 세팅(리눅스 기준) admin 2017-09-09 1692
128 rtpengine config basic and opensips configuration and command admin 2017-09-06 1580
127 WebSocket Transport using OpenSIPS configuration 웹 소켓 컨피그레이션 기본 admin 2017-09-06 1544
126 OpenSIPS basic configuration script 기본 컨피그 admin 2017-09-05 1590
125 rtpengine install and config admin 2017-09-05 1611
124 Installing RTPEngine on Ubuntu 14.04 admin 2017-09-05 1634
123 compile only the textops module make modules=modules/textops modules admin 2017-09-05 1585
122 opensips command /sbin/opensipsctl detail admin 2017-09-04 1592
121 2017 08 31 opensips 2.32 install debian8.8 module install compile err modules admin 2017-09-04 1613
120 Build-Depends debian 8.8 opensips 2.3 admin 2017-09-04 1566
119 What is new in 2.3.0 opensips admin 2017-09-04 1733
118 ubuntu 安装配置opensips,rtpproxy,mediaproxy admin 2017-09-04 1580
117 How to install Mediaproxy 2.5.2 on CentOS 6 64 bit admin 2017-09-04 1646
116 Using TLS in OpenSIPS v2.2.x configuration admin 2017-09-04 1637
115 How to 2.3 download , OpenSIPS new apt repository. DEBs for Debian / Ubuntu admin 2017-09-02 1609
114 You can install CDRTool in the following ways: admin 2017-09-01 1658
113 How to Install OpenSIPS 2.1.2 Server on Ubuntu 15.04 admin 2017-09-01 1694
112 Opensips 2.32 download admin 2017-09-01 1594
111 OpenSIPS 2.3 install admin 2017-09-01 1716
110 JsSIP: The JavaScript SIP Library admin 2017-09-01 1661
109 WebSocket Transport using OpenSIPS admin 2017-09-01 1695
108 A2Billing and OpenSIPS – Part 1 admin 2017-08-29 1667
107 A2Billing and OpenSIPS – Part 2 admin 2017-08-29 1650
106 A2Billing and OpenSIPS – Part 3 admin 2017-08-29 1681
105 OpenSIPS 2.3 philosophy admin 2017-08-17 1860
104 The timeline for OpenSIPS 2.3 is admin 2017-08-17 1994
103 OpenSIPS Control Panel and Homer integration admin 2017-08-17 1715
102 Opensips sip capture re designed admin 2017-07-16 1892
101 WebRTC with OpenSIPS WebSocket is a protocol provides full-duplex admin 2015-04-04 6637
100 WebSocket Support in OpenSIPS 2.1 admin 2015-04-04 7200
99 OpenSIPS 2.1 (rc) is available, download now! admin 2015-03-22 6763
98 Service Provision Using Asterisk & OpenSIPS - AstriCon 2014 admin 2015-02-25 8355
97 SIP Signaling-Messages OpenSIPS Running On Multicore Server file admin 2014-11-02 16015
96 opensips.cfg for Asterisk admin 2014-10-20 18151
95 A2Billing and OpenSIPS config admin 2014-10-20 17508
94 Jitsi Videobridge meets WebRTC admin 2014-10-18 17587
93 A Survey of Open Source Products for Building a SIP Communication Platform admin 2014-10-18 17157
92 Script Function , Module Index v1.11 함수 모듈 opensips admin 2014-10-14 17350
91 Opensips TM module enables stateful processing of SIP transactions admin 2014-10-04 15073
90 kamailio.cfg configuration Example admin 2014-10-04 17231
89 opensips NAT Traversal Module admin 2014-10-02 16604
88 UAC Registrant Module admin 2014-09-28 18146
87 MediaProxy 2.3.x & OpenSIPS 1.5.x Integration admin 2014-08-24 17226
86 RTPPROXY Admin Guide admin 2014-08-24 17599
85 CANCEL MESSAGE not handled correctly admin 2014-08-23 17412
84 [Sipdroid] SIP data collection study tour admin 2014-08-23 18023
83 [OpenSIPS-Users] Opensips 1.10 NAT radius aaa admin 2014-08-23 17995
82 OpenSIPS Consultancy Pricing module install Server 판매 또는 설치및 컨설팅 가이드 admin 2014-08-23 17887
81 ICE: The ultimate way of beating NAT in SIP admin 2014-08-23 17652
80 Many OPENSIPS Configuration Examples This will Help you admin 2014-08-23 17321
79 Real-time Charging System for Telecom & ISP environments admin 2014-08-23 17928
78 OPENSIPS EBOOK admin 2014-08-21 17934
77 Opensips Documentation Function admin 2014-08-21 18123
76 Presence Tutorial OpenXCAP setup admin 2014-08-18 17171
75 Opensips Modules Documentation admin 2014-08-18 18030
74 A lightweight RPC library based on XML and HTTP admin 2014-08-18 17512
73 opensips Nat script with RTPPROXY - English Good perfect admin 2014-08-15 15657
72 OpenSIPS Control Panel (OCP) Installation Guide Good admin 2014-08-13 15540
71 Installation and configuration process record opensips opensips-cp admin 2014-08-13 28770
70 OpenSIPS as Homer Capture server admin 2014-08-13 15370
69 OpenSIPS , default script , Types of Routs , Routing in SIP, Video lecture admin 2014-08-13 17317
68 Configuracion de Kamailio 3.3 con NAT Traversal y XCAP. admin 2014-08-12 17734
67 Under RHEL6.5 install OpenSIPS 1.11.1 tls admin 2014-08-12 16634
66 OpenSIPS/OpenSER-a versatile SIP Server cfg admin 2014-08-11 18063
65 Kamailio Nat Traversal using RTPProxy admin 2014-08-11 17639
64 MediaProxy wiki page install configuration admin 2014-08-11 17655
63 오픈소스 (사내)메신저 서버 구축, 오픈 파이어(openfire) 설치방법과 세팅 admin 2014-08-11 26584
62 MediaProxy Installation Guide admin 2014-08-10 17235
61 RTPProxy 1.2.x Installation & Integration with OpenSIPS 1.5x admin 2014-08-10 18421
60 Opensips Installation, How to. Good guide wiki page admin 2014-08-10 15278
59 OpenSIPS Installation Notes admin 2014-08-09 14584
58 Installation and configuration process record opensips 1.9.1 admin 2014-08-09 17167
57 opensips 1.11.2 install Good Giide admin 2014-08-09 17215
56 fusionPBX install debian wheezy admin 2014-08-09 17524
55 opensips 1.11.2 install guide good 인스톨 가이드 admin 2014-08-09 17042
54 SigIMS IMS Platform admin 2014-05-24 18269
53 2013 2012년 분야별 최고의 오픈소스 소프트웨어 124선 admin 2014-04-05 18997
52 Video conference server OpenMCU-ru - Introduction admin 2014-04-01 20433
51 SIPSorcery admin 2014-03-18 18522
50 Ekiga (formely known as GnomeMeeting) is an open source SoftPhone admin 2014-03-12 18905
49 telepresence: Open Source SIP Telepresence/MCU admin 2014-03-12 20959
48 SIP PBX - OpenSIPS and Asterisk configuration admin 2014-03-12 16748
47 Conference Support in Kamailio (OpenSER) admin 2014-03-12 19225
46 OpenSIPS configuration for 2 or more FreeSWITCH installs admin 2014-03-12 16552
45 The Impact of TLS on SIP Server Performance file admin 2014-03-12 18711
44 book-opensips-101 / content / 3.2. SIP TLS Secure Calling.mediawiki admin 2014-03-12 17678
43 Where to check OpenSIPS does not start? admin 2014-03-09 18191
42 opensips-1.10.0_src.tar.gz experimental source code documentation admin 2014-03-09 19061
41 Kamailo OpenSIPs installation on Debian admin 2014-03-09 17553
40 Using the openSIPS Registrant Module admin 2014-03-09 19090
39 RTPproxy Frequentry Asked Questions (FAQ) ¶ admin 2014-03-07 17088
38 Building Telephony Systems with OpenSIPS 1.6 RTPProxy + OpenSIPS 1.7 admin 2014-03-07 18599
37 Installing RTPproxy Start RTPproxy in Bridged mode very good admin 2014-03-07 22724
36 OpenSIPS Control Panel (OCP) Installation Guide admin 2014-03-06 16960
35 OpenSIPS Control Panel install guide admin 2014-03-06 17845
34 rtpproxy Module admin 2014-03-06 18588
33 MediaProxy Installation Guide admin 2014-03-06 19490
32 How to install OpenSIPS on CentOS debian module add xcap admin 2014-03-06 19174
31 Problem with presence_xml module Opensips 1.9 admin 2014-03-06 18719
30 Building Telephony Systems with OpenSIPS 1.6 books file admin 2014-03-06 19596
29 Multimedia Service Platform admin 2014-03-06 18001
28 How to install OpenSIPS on CentOS Debian etc admin 2014-03-05 18991
27 Opensips Installation, How to. admin 2014-03-05 15427
26 100% CPU usage opensips admin 2014-03-05 18310
25 A2Billing and OpenSIPS admin 2014-03-04 19222
24 Opensips_1.9 install guide this is great I like this admin 2014-03-04 23405
23 Opensips install debian admin 2014-03-03 19286
22 Open Source VOIP applications, both clients and servers. admin 2013-11-20 19605
21 OfficeSIP Server is freeware VoIP, SIP server for Windows admin 2013-09-11 20271
20 My new toy: Bluebox-ng admin 2013-04-06 33666
19 Flooding Asterisk, Freeswitch and Kamailio with Metasploit admin 2013-04-06 29419
18 Asterisk Installation Asterisk Realtime configuration admin 2013-04-06 23050
17 The SIP Router Project admin 2013-04-06 22098
16 Kamailio :: A Quick Introduction admin 2013-04-06 19211
15 Welcome to the Smartvox Knowledgebase admin 2013-04-06 19899
14 Kamailio 3.3.x and Asterisk 10.7.0 Realtime Integration using Asterisk Database admin 2013-04-06 23446
13 OpenSIPS vs Asterisk admin 2013-04-06 33172
12 OpenSER_from_an_asterisk_POV file admin 2013-04-06 19829
11 Using SIP Devices behind NAT OPensip Asterisk IPPhone SIP Telephony file admin 2013-03-31 38314
10 rfc5766-turn-server admin 2013-03-21 21710
9 OpenSIPS Kick Start‎: VIDEO admin 2013-02-20 19102