Freeswitch dial the extension number

 

summary

Telephone voice service , There is a slightly more complex scenario , It is the landing scene of the switchboard extension , After the customer dials the switchboard number , You need to dial the extension number to transfer to the designated telephone .

The extension number is usually dialed after the switchboard is connected , There will be a voice prompt , After the switchboard receives the number, it will be transferred to the extension .

The implementation of extension number transfer is actually the same as IVR The implementation of is consistent , It's all through DTMF Code receipt No .

This document does not cover how to land the switchboard extension , But how to pass fs Automatically dial the extension .

Environmental Science

centos：CentOS  release 7.0 (Final) Or above

freeswitch：v1.8.7

GCC：4.8.5

APP Interface

Freeswitch Yes app Interface “send_dtmf”, It is very convenient to send DTMF code , The source code in mod_dptools modular .

The method is simple to use , The format is as follows .

send_dtmf <dtmf digits>[@<tone_duration>]

example , Dial plan

<action application="send_dtmf" data="0123456789ABCD*#@100"/>

example ,C++ Code .

char *extnum = "123456";

if (SWITCH_STATUS_SUCCESS != switch_core_session_execute_application(session, "send_dtmf", extnum))

{

    switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_WARNING,

        "send_dtmf failed, extnum = %s\n", extnum);

}

Dial plan configuration

modify fs The configuration file /usr/local/freeswitch/conf/dialplan/test.xml

<include>

        <context name="ext_test">

                <extension name="test" continue="false">

                        <condition field="destination_number" expression="^(\d+)$">

                                <action application="sched_hangup" data="+10"/>

                                <action application="send_dtmf" data="987654321"/>

                                <action application="endless_playback" data="/usr/local/freeswitch/sounds/101-baidu-mp3.mp3"/>

                        </condition>

                </extension>

        </context>

</include>

test

stay freeswitch Use in command line originate Make a call , Then go to the dial plan ext_test send out DTMF.

[email protected]> originate {originator_codec=PCMA,origination_caller_id_number=0755110}sofia/external/sip:[email protected]:5080 1001 XML ext_test

fs call 138 On the server 1001, After the call is connected , send out DTMF, The log is as follows .

2022-06-10 15:57:57.810985 [INFO] mod_dialplan_xml.c:637 Processing  <0755110>->1001 in context ext_test

Dialplan: sofia/external/[email protected]:5080 parsing [ext_test->test] continue=false

Dialplan: sofia/external/[email protected]:5080 Regex (PASS) [test] destination_number(1001) =~ /^(\d+)$/ break=on-false

Dialplan: sofia/external/[email protected]:5080 Action sched_hangup(+10)

Dialplan: sofia/external/[email protected]:5080 Action send_dtmf(987654321)

Dialplan: sofia/external/[email protected]:5080 Action endless_playback(/usr/local/freeswitch/sounds/101-baidu-mp3.mp3)

...

EXECUTE sofia/external/[email protected]:5080 send_dtmf(987654321)

2022-06-10 15:57:57.810985 [DEBUG] switch_core_io.c:1918 sofia/external/[email protected]:5080 send dtmf

digit=9 ms=250 samples=2000

2022-06-10 15:57:57.810985 [DEBUG] switch_core_io.c:1918 sofia/external/[email protected]:5080 send dtmf

digit=8 ms=250 samples=2000

...

EXECUTE sofia/external/[email protected]:5080 endless_playback(/usr/local/freeswitch/sounds/101-baidu-mp3.mp3)

2022-06-10 15:57:57.810985 [DEBUG] switch_ivr_play_say.c:1498 Codec Activated [email protected] 1 channels 20ms

2022-06-10 15:57:57.820986 [DEBUG] switch_rtp.c:5237 Send start packet for [9] ts=160 dur=160/160/2000 seq=65154 lw=160

2022-06-10 15:57:57.820986 [DEBUG] switch_rtp.c:5136 Send middle packet for [9] ts=160 dur=320/320/2000 seq=65155 lw=320

2022-06-10 15:57:57.841015 [DEBUG] switch_rtp.c:5136 Send middle packet for [9] ts=160 dur=480/480/2000 seq=65156 lw=480

2022-06-10 15:57:57.841015 [DEBUG] switch_rtp.c:5136 Send middle packet for [9] ts=160 dur=640/640/2000 seq=65157 lw=640

2022-06-10 15:57:57.861013 [DEBUG] switch_rtp.c:5136 Send middle packet for [9] ts=160 dur=800/800/2000 seq=65158 lw=800

2022-06-10 15:57:57.861013 [DEBUG] switch_rtp.c:5136 Send middle packet for [9] ts=160 dur=960/960/2000 seq=65159 lw=960

2022-06-10 15:57:57.881025 [DEBUG] switch_rtp.c:5136 Send middle packet for [9] ts=160 dur=1120/1120/2000 seq=65160 lw=1120

2022-06-10 15:57:57.881025 [DEBUG] switch_rtp.c:5136 Send middle packet for [9] ts=160 dur=1280/1280/2000 seq=65161 lw=1280

2022-06-10 15:57:57.901015 [DEBUG] switch_rtp.c:5136 Send middle packet for [9] ts=160 dur=1440/1440/2000 seq=65162 lw=1440

2022-06-10 15:57:57.901015 [DEBUG] switch_rtp.c:5136 Send middle packet for [9] ts=160 dur=1600/1600/2000 seq=65163 lw=1600

2022-06-10 15:57:57.921012 [DEBUG] switch_rtp.c:5136 Send middle packet for [9] ts=160 dur=1760/1760/2000 seq=65164 lw=1760

2022-06-10 15:57:57.921012 [DEBUG] switch_rtp.c:5136 Send middle packet for [9] ts=160 dur=1920/1920/2000 seq=65165 lw=1920

2022-06-10 15:57:57.941013 [DEBUG] switch_rtp.c:5136 Send end packet for [9] ts=160 dur=2080/2080/2000 seq=65166 lw=1920

2022-06-10 15:57:57.941013 [DEBUG] switch_rtp.c:5136 Send end packet for [9] ts=160 dur=2080/2080/2000 seq=65167 lw=1920

2022-06-10 15:57:57.941013 [DEBUG] switch_rtp.c:5136 Send end packet for [9] ts=160 dur=2080/2080/2000 seq=65168 lw=1920

2022-06-10 15:57:57.941013 [DEBUG] switch_rtp.c:5084 Queue digit delay of 40ms

2022-06-10 15:57:57.980986 [DEBUG] switch_rtp.c:5237 Send start packet for [8] ts=1440 dur=160/160/2000 seq=65171 lw=1440

2022-06-10 15:57:57.980986 [DEBUG] switch_rtp.c:5136 Send middle packet for [8] ts=1440 dur=320/320/2000 seq=65172 lw=1600

2022-06-10 15:57:57.991013 [DEBUG] switch_rtp.c:5136 Send middle packet for [8] ts=1440 dur=480/480/2000 seq=65173 lw=1760

2022-06-10 15:57:57.991013 [DEBUG] switch_rtp.c:5136 Send middle packet for [8] ts=1440 dur=640/640/2000 seq=65174 lw=1920

2022-06-10 15:57:58.021023 [DEBUG] switch_rtp.c:5136 Send middle packet for [8] ts=1440 dur=800/800/2000 seq=65175 lw=2080

2022-06-10 15:57:58.021023 [DEBUG] switch_rtp.c:5136 Send middle packet for [8] ts=1440 dur=960/960/2000 seq=65176 lw=2240

2022-06-10 15:57:58.041014 [DEBUG] switch_rtp.c:5136 Send middle packet for [8] ts=1440 dur=1120/1120/2000 seq=65177 lw=2400

2022-06-10 15:57:58.041014 [DEBUG] switch_rtp.c:5136 Send middle packet for [8] ts=1440 dur=1280/1280/2000 seq=65178 lw=2560

2022-06-10 15:57:58.061012 [DEBUG] switch_rtp.c:5136 Send middle packet for [8] ts=1440 dur=1440/1440/2000 seq=65179 lw=2720

2022-06-10 15:57:58.061012 [DEBUG] switch_rtp.c:5136 Send middle packet for [8] ts=1440 dur=1600/1600/2000 seq=65180 lw=2880

2022-06-10 15:57:58.081014 [DEBUG] switch_rtp.c:5136 Send middle packet for [8] ts=1440 dur=1760/1760/2000 seq=65181 lw=3040

2022-06-10 15:57:58.081014 [DEBUG] switch_rtp.c:5136 Send middle packet for [8] ts=1440 dur=1920/1920/2000 seq=65182 lw=3200

2022-06-10 15:57:58.101024 [DEBUG] switch_rtp.c:5136 Send end packet for [8] ts=1440 dur=2080/2080/2000 seq=65183 lw=3200

2022-06-10 15:57:58.101024 [DEBUG] switch_rtp.c:5136 Send end packet for [8] ts=1440 dur=2080/2080/2000 seq=65184 lw=3200

2022-06-10 15:57:58.101024 [DEBUG] switch_rtp.c:5136 Send end packet for [8] ts=1440 dur=2080/2080/2000 seq=65185 lw=3200

2022-06-10 15:57:58.101024 [DEBUG] switch_rtp.c:5084 Queue digit delay of 40ms

...

summary

After the call is connected , Use send_dtmf send out DTMF code , But in actual use , There are two problems .

The first question is , send out DTMF The code will be superimposed with the playback voice .

The second question is , send out DTMF code app After performing , Not immediately , Instead, wait for the media stream to be sent and start sending .

I wanted to finish the source code flow together , But after tracing the source code , It is found that the logic of code calls is complex , There are many jumps between different modules , A separate chapter will be devoted to the code flow .

Empty as usual

Be serious