한국어

IPPBX/GW

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


T.38 Fax Gateway Asterisk

2015.05.05 19:54

admin 조회 수:18075

https://wiki.asterisk.org/wiki/display/AST/T.38+Fax+Gateway


Full T.38 Capabilities

Initial support for handling of T.38 sessions was merged into the Asterisk 1.4 codebase. Inside of Asterisk 1.4, it is possible to perform what is referred to as T.38 passthrough. T.38 Passthrough allows Asterisk to carry T.38 UDPTL from one T.38-speaking endpoint to another T.38-speaking endpoint. Asterisk does not modify the media. Asterisk 1.6, in addition to its T.38 passthrough capabilities, introduced T.38 termination support, such that T.38 fax sessions could be initiated from locally stored TIFF files (SendFax) or that T.38 fax sessions could be terminated into locally stored TIFF files (ReceiveFax). The basic faxing capabilities of Asterisk 1.8 remained the same as 1.6.

The limitation of these versions of Asterisk is that while 1.6 - 1.8 are fully capable of passing through or terminating T.38 sessions, there is no capability for T.38 gateway. Older versions of Asterisk cannot directly pass a fax from the PSTN or a non-T.38 endpoint to a T.38 endpoint. Instead, older versions of Asterisk require that two separate calls be established - e.g. one to receive the Fax into a TIFF file (ReceiveFax), and an entirely separate call to send the Fax from a TIFF file to a fax machine (SendFax), or vice versa.

Asterisk 10 overcomes this limitation and provides full T.38 Fax Gateway support. T.38 Gateway provides a number of advantages over the older, two-step store-and-forward method (generally referred to as T.37). Advantages include: end-to-end confirmation of receipt (with two separate calls the callee doesn't necessarily know the caller was trying to send them a fax), reduced time to fax (not receiving and then sending separately cuts the time in half), and increased reliability (no concerns about the reliability of local file storage or the TIFF interpreters).

Enabling T.38 Gateway mode

In order to affect this new T.38 Gateway capability, an additional option, gateway, has been added to the FAXOPT Dialplan Function. Enabling this option can be done like:

exten => 1,1,NoOp()
exten => 1,n,Set(FAXOPT(gateway)=yes)
exten => 1,n,Dial(SIP/mypeer,20)

Here, we use the gateway option in combination with the Dial application:

Using T.38 Gateway mode

T.38 Gateway mode should be used when one leg of a call is not capable of T.38 mode. In the event that both legs are capable and Gateway mode is configured, then the Gateway will step out of the way, allowing transparent T.38 passthrough.

The T.38 Gateway code uses an audiohook to monitor the line for the presence of fax. The monitoring checks for both V.21 preamble and T.38 Re-INVITE from the remote party. If neither is detected within a 10 second window, the Gateway shuts down, removing the audiohook from the channel, and allows the call to complete transparently.

T.38 Gateway with Local Termination Fallback

It is also possible to use Gateway mode in combination with local Termination mode for calls received by Asterisk - if, for example the second call leg to a peer or number is not possible. In order to accomplish this, Gateway mode must be disabled on the current channel, or the ReceiveFax application will not be run. This can be accomplished like:

exten => 1,1,NoOp()
exten => 1,n,Set(FAXOPT(gateway)=yes)
exten => 1,n,Dial(SIP/mypeer,20)
exten => 1,n,Verbose(Failed to dial 'SIP/mypeer': ${DIALSTATUS})
exten => 1,n,Set(FAXOPT(gateway)=no)
exten => 1,n,ReceiveFax(myreceivedfile.tiff,d)
Icon

It is possible to set a channel variable for a SIP peer such that gateway mode is always enabled. This can be accomplished for a SIP peer in sip.conf like:

[mypeer]
type=peer
host=dynamic
secret=chooseabetterpassword
context=default
setvar=FAXOPT(gateway)=yes

T.38 Gateway Fax Activity Timeout

By default, gateway mode will remain enabled throughout the life of a channel. An optional timeout can be enabled to automatically disable gateway mode if there is no fax activity a given time after two channels are bridged. Enabling a timeout also has the side effect of reserving fax resources for a channel. The timeout can be enabled by passing second parameter (a timeout in seconds) when setting FAXOPT(gateway).

exten => 1,1,NoOp()
exten => 1,n,Set(FAXOPT(gateway)=yes,10) ; disable gateway if there is no fax activity in 10 seconds
exten => 1,n,Dial(SIP/mypeer,20)
번호 제목 글쓴이 날짜 조회 수
98 php memory and filesize increase upload wav admin 2019.06.25 1534
97 changing SIP drivers to CHAN_PJSIP Please err 에러 admin 2019.06.21 2037
96 /dev/mapper/ubuntu--vg-root filling up admin 2019.04.08 8086
95 VICIdial Scratch Installation CentOS 7 & MariaDB & Asterisk 11 & Latest VICIdial SVN admin 2017.09.02 17744
94 Asterisk Answering Machine Detection (AMD) Configuration admin 2017.09.01 17727
93 List of 5 Open Source Call Center Software Programs admin 2017.08.31 18032
92 Smart Predictive Auto calling Software System: Automatic Phone Calling admin 2017.08.31 17565
91 WombatDialer is highly scalable, multi-server, works with your existing Asterisk PBX. admin 2017.08.31 17486
90 Asterisk based auto dialer test and verified by 300+ concurrent. admin 2017.08.31 17299
89 Automatic Call Distribution (ACD) Asterisk as Call Center admin 2017.08.31 18037
88 Introducing Asterisk Call Distribution ACD asterisk admin 2017.08.31 17602
87 How to build an outbound Call Center with Newfies-Dialer and Asterisk/FreePBX admin 2017.08.31 17614
86 IVR actions asterisk admin 2017.08.31 17379
85 iptables for asterisk simple example configuration admin 2017.08.31 17519
84 초보) Asterisk , AsteriskNow 무엇인가? 무슨차이인가? 시작 배우기 쉽게 이해 공부 사용 admin 2017.08.29 17797
83 Installing FreePBX 14 on Debian 8.8 These instructions work fine admin 2017.08.29 17789
82 FreePBX 12 – Getting Started Guide admin 2017.08.29 17408
81 Playing text to speech inside read function in asterisk admin 2017.08.28 17544
80 Speech Recognition on Asterisk: Getting Started admin 2017.08.28 19019
79 github A2Billing is commercially supported by Star2Billing admin 2017.08.26 17428
78 Insert into dialplan Asterisk admin 2017.08.26 17430
77 Google letter agi admin 2017.08.26 17373
76 Top 10 greater worker admin 2017.08.26 17457
75 Dialplan handler routines allow customization admin 2017.08.26 17591
74 AGI asterisk gateway interface synopsis admin 2017.08.26 18387
73 Make Your Own IVR with Asterisk admin 2017.08.26 17947
72 Asterisk dialolan detail explan good easy clean admin 2017.08.26 17360
71 download Installing+AsteriskNOW admin 2017.08.25 17396
70 TwistedWave Online A browser-based audio editor admin 2017.08.25 17570
69 Asterisk/IVR/PBX/VoIP/Contact center/Voicebroadcast engineer admin 2017.08.25 17416
68 asterisk Chapter 6. Dialplan Basics admin 2017.08.25 17369
67 RPi Text to Speech (Speech Synthesis) admin 2017.08.24 17322
66 asterisk freepbx TTS Engine Custom - Amazon Polly - 24 languages admin 2017.08.24 17491
65 asterisk CRM SUGARCRM SuiteCRM admin 2017.08.24 17491
64 Hosting Cheap VPS Hosting that doesn’t feel cheap admin 2017.08.24 17396
63 HOW TO INSTALL FREEPBX ON CENTOS 7 admin 2017.08.24 17504
62 Setup Asterisk 13 with FreePBX 13 in CentOS 7 admin 2017.08.24 17722
61 asterisk XactView V3-CRM Widget admin 2017.08.24 17389
60 Text to Speech User Guide admin 2017.08.24 17450
59 Text to speech for asterisk using Google Translate admin 2017.08.24 17862
58 User Control Panel (UCP) 14+ admin 2017.08.23 17519
57 라즈베리파이, 아스타리스크(asterisk) PBX(사설교환기) admin 2017.08.23 20295
56 How to Install Asterisk on CentOS 7 easy clean explain 깔금한 쉬운 설명 admin 2017.08.23 19532
55 Fusionpbx v4 Freeswitch v1.6 CentOS v7 Install Guide admin 2017.08.23 17789
54 Asterisk Freepbx Install Guide (CentOS v7, Asterisk v13, Freepbx v13) admin 2017.08.23 17653
53 A2Billing v2.2 Install Guide CentOS v7 Asterisk v11 v13 seems to work FreePBX v13 admin 2017.08.23 17717
52 How to install and setup Asterisk 14 (PBX) on CentOS 7 admin 2017.08.23 17813
51 How to Install Asterisk 13 on Ubuntu 16.04 from Source admin 2017.08.23 17546
50 thirdlane PBX price admin 2017.08.23 17371
49 SUGAR CRM admin 2017.08.23 17330
48 NAT 와 VoIP 시그널과 RTP 전송 영향 NAT와 방화벽/STUN/TURN/ICE/SBC admin 2017.08.19 17337
47 음성통화 서버 Asterisk + FreePBX / 통화 시연해보기 admin 2017.08.18 17414
46 우분투 Mumble VoIP 음성채팅서버 구축 admin 2017.08.18 17355
45 User Control Panel (UCP) asterisk freepbx admin 2017.08.17 17586
44 Configuring Your PBX admin 2017.08.17 17287
43 Installing SNG7 Official Distro admin 2017.08.17 17471
42 OPUS and VP9 Bitrates admin 2017.08.17 17566
41 Capturing SIP and RTP traffic using tcpdump admin 2017.08.17 17432
40 Asterisk Answering Machine Detection (AMD) Configuration admin 2017.08.17 17377
39 Price ,,Install Commercial Modules on CentOS and RHEL based admin 2017.08.16 17621
38 asterisk IVR 쉽게 설정하기 admin 2017.08.16 17415
37 Asterisk 가장쉬운 설치 및 설정 사용 방법 이해 할수있게 배우는 순서 안내 설명 admin 2017.08.16 18437
36 /sbin/service httpd start stop web start stop admin 2017.08.16 17399
35 asterisk FreePBX 14, Distro 14 & More! admin 2017.08.16 17581
34 asterisk dialplan 설명 admin 2017.08.16 17548
33 how-to-freepbx-13-firewall-setup admin 2017.08.14 17242
32 AsterSwitchboard CTI Operator Panel for Asterisk admin 2017.08.08 17411
31 Brand New Sealed Sangoma FreePBX 60 - 75 Users or 30 Calls admin 2017.08.05 17559
30 Asterisk 설치 준비 admin 2015.11.15 17997
29 Asterisk 13 Debian 8 admin 2015.11.13 17567
28 FOIP: T.38 Fax Relay vs. G.711 Fax Pass-Through (Fax Over IP) admin 2015.09.24 17668
27 Considerations for Using T.38 versus G.711 for Fax over IP file admin 2015.09.24 17992
26 MP3 to WAV, WMA to WAV, OGG Convert audio to WAV online admin 2015.05.09 18211
25 FAX over IP sofware admin 2015.05.05 18193
24 Fax Configuration FREE PBX and asterisk FAX admin 2015.05.05 17909
23 Asterisk AGI/AMI to ARI Asterisk&FreePbx - IVR setting admin 2015.05.05 18084
22 A simple IVR and Queue example where customer listens to marketing materials .. admin 2015.05.05 18124
21 Asterisk A simple IVR admin 2015.05.05 18218
20 Asterisk tips ivr menu Interactive voice response menus admin 2015.05.05 18724
19 Setup install Asterisk PBX telephony system | VOIP Tutorial admin 2015.05.05 17895
18 Asterisk Downloads AsteriskNOW Software PBX admin 2015.05.05 17885
17 Fax For Asterisk download add on 1 port free IVR prompt G.729 admin 2015.05.05 18144
» T.38 Fax Gateway Asterisk admin 2015.05.05 18075
15 Setup FAX on Asterisk with DIDForSale SIP DIDs admin 2015.05.05 18158
14 FaxServer using Asterisk admin 2015.05.05 18079
13 fax licenses Asterisk admin 2015.05.05 18016
12 Configuring an Asterisk server admin 2015.05.05 17952
11 FreePBX – Custom FAX to email admin 2015.05.05 17968
10 Incoming Fax Handling admin 2015.05.05 18172
9 Using Asterisk to Detect and Redirect Fax Calls for Communications Server admin 2015.05.05 18244
8 Asterisk fax Asterisk and fax calls Fax over IP admin 2015.05.05 18547
7 Securing Your Asterisk VoIP Server with IPTables admin 2015.05.05 19078
6 A2Billing v2 Install Guide admin 2015.05.05 18738
5 Freepbx on Debian (Debian v7, Asterisk v11, Freepbx v2.11) admin 2015.05.05 18489
4 Asterisk Freepbx Install Guide (CentOS v6, Asterisk v13, Freepbx v12) admin 2015.05.05 19437
3 Asterisk Quick Start Guide admin 2015.05.05 18626
2 Installing AsteriskNOW Official Distro admin 2015.05.05 18064
1 Generic Asterisk SIP Configuration Guide admin 2015.05.05 18034