要把 FreeSWITCH 之 chat 完全研究清楚，似乎不容易

发送，路由，接收

跟哪些模块有关

等等

咱一边查资料，一边整理，不着急

---

先看看 Kamalio 怎么发 MESSAGE

loadmodule "uac.so"

route[uac_send_message] {
    $uac_req(method) = "MESSAGE";
    $uac_req(ruri) = "sip:10.0.1.5:5060";
    $uac_req(furi) = "sip:Emergency Alert";
    $uac_req(turi) = "sip:thisphone";
    # $uac_req(callid) = 
    $uac_req(hdrs) = "Subject: Emergency Alert\r\n";
    $uac_req(hdrs) = $uac_req(hdrs) + "Content-Type: text/plain\r\n";
    $uac_req(body) = "hi\r\n";
    $uac_req(evroute) = 1; # fire 路由，成功不成功，在路由块里面可以获取到
    uac_req_send();
}


event_route[uac:reply] {
	xinfo("===uac reply received, callid = $uac_req(callid), tu = $uac_req(turi), code = $uac_req(evcode)\n");
}

也可以设置 outbound proxy

$uac_req(ouri)  = "sip:1.2.3.4:5060";

---

现在来看看 FS 怎么发送 MESSAGE

当然，首先得加载 mod_sms

local event = freeswitch.Event("CUSTOM", "SMS::SEND_MESSAGE");
event:addHeader("proto", "sip");
event:addHeader("dest_proto", "sip");
event:addHeader("from", "1004@192.168.0.81");
event:addHeader("from_full", "sip:1004@192.168.0.81");
event:addHeader("to", "sip:1001@192.168.31.73:6666");
event:addHeader("subject", "12345678abcd");
event:addHeader("type", "text/plain");
event:addHeader("hint", "the hint");
event:addHeader("replying", "true");
event:addHeader("sip_profile", "internal");
event:addBody("Hi\r\n");
 
freeswitch.consoleLog("info", event:serialize());
event:fire();
 

如此就可以发送，目的地址是 sip:192.168.31.73:6666, 后者运行的是 MircoSIP, 配置文件里面设置 sourcePort=6666,会自动弹一个框出来，显示 `Hi`

---

fs_cli -x 'show chat'

show chat
type,name,ikey
chat,GLOBAL_SMS,mod_sms
chat,api,mod_dptools
chat,conf,mod_conference
chat,event,mod_dptools
chat,sip,mod_sofia
chat,verto,mod_verto

6 total.

哈哈，很清楚了

dest_proto 如果为 sip，那么 mod_sofia 来处理 chat 发送

dest_proto 如果为 verto，那么 mod_verto 来处理 chat 发送

以此类推，可以发到 会议，会议里面可以 chat, FS 的设计好牛

---

发送之后怎么看结果呢，怎么看 reply ？

答案是 SMS::DELIVERY_REPORT 子类，主键应该是 subject

下面是二个事件：

RECV EVENT
Event-Subclass: SMS::SEND_MESSAGE
Event-Name: CUSTOM
Core-UUID: b98d6556-a3cb-4b2b-8cca-a83386abbcfd
FreeSWITCH-Hostname: debian12
FreeSWITCH-Switchname: debian12
FreeSWITCH-IPv4: 192.168.31.213
FreeSWITCH-IPv6: ::1
Event-Date-Local: 2025-03-09 19:36:34
Event-Date-GMT: Sun, 09 Mar 2025 11:36:34 GMT
Event-Date-Timestamp: 1741520194385173
Event-Calling-File: switch_cpp.cpp
Event-Calling-Function: Event
Event-Calling-Line-Number: 315
Event-Sequence: 940
proto: sip
dest_proto: sip
from: 1004@192.168.0.81
from_full: sip:1004@192.168.0.81
to: sip:1001@192.168.31.73:6666
subject: 12345678abcd
type: text/plain
hint: the hint
replying: true
sip_profile: internal
skip_global_process: true
dest_proto: sip
Nonblocking-Delivery: true
skip_global_process: true
Content-Length: 4
Content-Length: 4

Hi

RECV EVENT
Event-Subclass: SMS::DELIVERY_REPORT
Event-Name: CUSTOM
Core-UUID: b98d6556-a3cb-4b2b-8cca-a83386abbcfd
FreeSWITCH-Hostname: debian12
FreeSWITCH-Switchname: debian12
FreeSWITCH-IPv4: 192.168.31.213
FreeSWITCH-IPv6: ::1
Event-Date-Local: 2025-03-09 19:36:34
Event-Date-GMT: Sun, 09 Mar 2025 11:36:34 GMT
Event-Date-Timestamp: 1741520194385173
Event-Calling-File: mod_sms.c
Event-Calling-Function: send_report
Event-Calling-Line-Number: 48
Event-Sequence: 941
Status: Accepted
Core-UUID: b98d6556-a3cb-4b2b-8cca-a83386abbcfd
FreeSWITCH-Hostname: debian12
FreeSWITCH-Switchname: debian12
FreeSWITCH-IPv4: 192.168.31.213
FreeSWITCH-IPv6: ::1
Event-Date-Local: 2025-03-09 19:36:34
Event-Date-GMT: Sun, 09 Mar 2025 11:36:34 GMT
Event-Date-Timestamp: 1741520194385173
Event-Calling-File: switch_cpp.cpp
Event-Calling-Function: Event
Event-Calling-Line-Number: 315
Event-Sequence: 940
proto: sip
dest_proto: sip
from: 1004@192.168.0.81
from_full: sip:1004@192.168.0.81
to: sip:1001@192.168.31.73:6666
subject: 12345678abcd
type: text/plain
hint: the hint
replying: true
sip_profile: internal
skip_global_process: true
dest_proto: sip
Nonblocking-Delivery: true
skip_global_process: true

请关注 subject 和 Status

另外，我目前测试的结果是，如果要获得准确的 Status，那么需要传 blocking 为 true，但我不确定我的测试结果是否 OK

请参考下面这段代码：

local event = freeswitch.Event("CUSTOM", "SMS::SEND_MESSAGE");
event:addHeader("proto", "sip");
event:addHeader("dest_proto", "sip");
event:addHeader("from", "1004@192.168.0.81");
event:addHeader("from_full", "sip:1004@192.168.0.81");
event:addHeader("to", "sip:1001@192.168.31.73:6666");
event:addHeader("subject", "12345678abcd");
event:addHeader("type", "text/plain");
event:addHeader("hint", "the hint");
event:addHeader("replying", "true");
event:addHeader("sip_profile", "internal");
event:addHeader("blocking", "true"); -- vip
event:addBody("Hi\r\n");
freeswitch.consoleLog("info", event:serialize());
event:fire();

把 MicroSIP 关闭掉

fs_cli 

console loglevel 0

/event plain all

运行上面的 lua 程序

过一会就能收到 DELIVERY_REPORT 事件，Status 为 Failure

---

要怎么设置 proxy呢？

笔者查了半天资料，终于找到了答案，可参考下面这个头：

contact-uri: sip:1002@192.168.0.99:11710;fs_path=sip:192.168.207.156:5060

重点是不要加 `<>`，加了就不好使

我查的资料讲的是发送 SIP NOTIFY 消息，那么发送SIP MESSAGE是否也如此

目前我还没进行测试

或者干脆增加 to_sip_ip 和 to_sip_port 参数

---

如何处理 chat 接收呢？

回答是 chatplan

我的习惯是先修改 sip profile, 增加一个 auth-messages = false 的配置，不然FS在收到 SIP MESSAGE 请求时会要求SIP 挑战，很麻烦

chatplan 里面能做什么？

mod_sms 有下面几个 app:

 show modules mod_sms

type,name,ikey,filename
application,final,mod_sms,/usr/local/freeswitch/mod/mod_sms.so
application,fire,mod_sms,/usr/local/freeswitch/mod/mod_sms.so
application,info,mod_sms,/usr/local/freeswitch/mod/mod_sms.so
application,reply,mod_sms,/usr/local/freeswitch/mod/mod_sms.so
application,send,mod_sms,/usr/local/freeswitch/mod/mod_sms.so
application,set,mod_sms,/usr/local/freeswitch/mod/mod_sms.so
application,stop,mod_sms,/usr/local/freeswitch/mod/mod_sms.so
application,system,mod_sms,/usr/local/freeswitch/mod/mod_sms.so
application,unset,mod_sms,/usr/local/freeswitch/mod/mod_sms.so
chat,GLOBAL_SMS,mod_sms,/usr/local/freeswitch/mod/mod_sms.so
 

目前我没有一个一个进行研究

这是自带的 chatplan：

<?xml version="1.0" encoding="utf-8"?>
<include>
  <context name="default">
    <extension name="demo">
      <condition field="to" expression="^(.*)$">
	<!--	<action application="lua" data="test.lua"/> -->
	<action application="reply" data="Hello, you said: ${body}"/>
      </condition>
    </extension>
  </context>
</include>

 lua 要怎么写呢？

对象不再是 session, 而是 message, message 有哪些方法呢?

• chat_send
• chat_execute
• setPriority
• addBody
• fire
• getType
• getHeader
• addHeader
• merge
• serialize
• getBody

下面是一个简单的 test.lua：

message:chat_execute("info")
message:chat_execute("final")

消息落地 ，不再转发，回 202

---

上面讲的是发送对话外 MESSAGE

那么对话内 MESSAGE 要怎么发送呢？

要研究下，除了 uuid_chat 是否还有别的？

---

mod_dptools 里面有个叫 chat 的 api, 很多资料都讲过了，这里不再赘述

其实弄了半天我发现自己还是没完全搞明白，以后再研究吧