该实验需要用PJSIP进行VOIP软件的开发，老师原本的要求比较低，只要编译源码然后打通学校的服务器即可（使用命令行）。我没有采用官方的GUI Demo（那个是用Qt和C++写的，而我讨厌这俩东西）而是用官方源码编译了Python API，然后用Tkinter写了界面（虽然不是很好看），在语音通话的基础上增加了登录、即时聊天、视频通话等功能。老师不要求自己搭建SIP服务器，而我比较闲（没事找事），在阿里云上分别搭建了3种不同的SIP服务器：Asterisk、OpenSips和MiniSipServer进行测试。

客户端安装

Pjproject

安装视频库和编码器

brew install sdl2
brew install ffmpeg
brew install openh264

下载源码

wget https://www.pjsip.org/release/2.9/pjproject-2.9.zip
unzip pjproject-2.9.zip
cd pjproject-2.9

添加视频支持，修改文件pjlib/include/pj/config_site.h, 添加如下内容：

#define PJMEDIA_HAS_VIDEO 1
#define FF_INPUT_BUFFER_PADDING_SIZE 32

编译安装

./configure --enable-shared
make dep && make
sudo make install

编译Python API

pjsua（官方已废弃）

Python版本：2.7.16

修改pjsip-apps/src/python/Makefile中的python版本为2

编译安装：make && make install

pjsua2

Python版本：3.6.8

修改pjsip-apps/src/swig/python/Makefile文件，将USE_THREADS的注释取消，否则会导致视频调用产生死锁

编译安装：make && make install

服务端安装

Asterisk

环境：阿里云 Ubuntu 16.04

安装：apt install asterisk

修改配置文件/etc/asterisk/sip.conf

[general]
externip = 120.78.218.59
localnet = 192.168.1.0/255.255.255.0
context = default
bindport = 5060
bindaddr = 0.0.0.0
tcpbindaddr = 0.0.0.0
tcpenable = yes
nat = yes

[1001]
type = friend
callerid = User One
secret = 1001
host = dynamic
canreinvite = no
dtmfmode = rfc2833
mailbox = 1001
disallow = all
allow = ulaw
transport = udp

[1002]
type = friend
callerid = User Two
secret = 1002
host = dynamic
canreinvite = no
dtmfmode = rfc2833
mailbox = 1002
disallow = all
allow = ulaw
transport = udp

修改配置文件/etc/asterisk/extensions.conf

[general]
static=yes
writeprotect=no

[default]
exten => 1001,1,Answer()
exten => 1001,n,Dial(SIP/1001,20,tr)
exten => 1001,n,Hangup

exten => 1002,1,Answer()
exten => 1002,n,Dial(SIP/1002,20,tr)
exten => 1002,n,Hangup

注意：由于我的阿里云服务器是公网IP，因此如要修改一下NAT配置。虽然asterisk使用SIP协议建立连接，但是语音数据包走的还是RTP协议，因此需要将阿里云的SIP(默认:5060)端口和RTP(默认:10000~20000)端口都开启，否则会没有声音。

OpenSips

安装依赖

apt install flex
apt install bison
apt install libxml2
apt install rtpproxy
apt install libssl-dev
apt install libxml2-dev
apt install mysql-server
apt install libncurses5-dev
apt install libmysqlclient-dev
apt install libcurl4-gnutls-dev

编译安装

下载：git clone https://github.com/OpenSIPS/opensips.git -b 2.4 opensips-2.4

进入根目录：cd opensips-2.4

多核编译make menuconfig -j

选中附加模块

• db_mysql
• presence
• presence_mwi
• presence_xml
• presence_dialoginfo
• xcap
• xcap-client

选择Compile And Install OpenSIPS

配置文件

编译完成后运行osipsconfig，并进行配置

选择Generate OpenSIPS Script->Residential Script->Configure Residential Script

• ENABLE_TCP
• USE_ALIASES
• USE_AUTH
• USE_DBACC
• USE_DBUSRLOC
• USE_DIALOG
• USE_NAT

选择Generate Residential Script并退出

将生成后的文件命名为opensips.cfg

修改/usr/local/etc/opensips/opensips.cfg

listen:udp:${ip}:5060
listen:tcp:${ip}:5060

# rtpproxy module
loadmodule "rtpproxy.so"
modparam("rtpproxy", "rtpproxy_sock", "udp:${ip}:12221")

# presence module
loadmodule "presence.so"
loadmodule "presence_xml.so"

modparam("presence","db_url","mysql://opensips:opensipsrw@localhost/opensips")
modparam("presence","server_address","sip:sa@${ip}:5060")
modparam("presence_xml","force_active",1)

# xcap module
loadmodule "xcap.so"

modparam("xcap","db_url","mysql://opensips:opensipsrw@localhost/opensips")

修改/usr/local/etc/opensips/opensipsctlrc

## your SIP domain
SIP_DOMAIN=${ip}

## chrooted directory
# $CHROOT_DIR="/path/to/chrooted/directory"

## database type: MYSQL, PGSQL, ORACLE, DB_BERKELEY, DBTEXT, or SQLITE
## by default none is loaded
# If you want to setup a database with opensipsdbctl, you must at least specify
# this parameter.
DBENGINE=MYSQL

## database port (PostgreSQL=5432 default; MYSQL=3306 default)
DBPORT=3306

## database host
DBHOST=localhost

## database name (for ORACLE this is TNS name)
DBNAME=opensips

# database path used by dbtext, db_berkeley, or sqlite
DB_PATH="/usr/local/etc/opensips/dbtext"

## database read/write user
DBRWUSER=opensips

## password for database read/write user
DBRWPW="opensipsrw"

## engine type for the MySQL/MariaDB tabels (default InnoDB)
MYSQL_ENGINE="MyISAM"

## database super user (for ORACLE this is 'scheme-creator' user)
DBROOTUSER="root"

# user name column
USERCOL="username"

运行opensipsdbctl create创建数据库

运行rtpproxy -F -l {ip} -s udp:${ip}:12221

运行opensipsctl start

MiniSipServer

操作系统: Windows 10

直接下载并安装即可