freeswitch internal architecture
Opensource SIP Application Server Mozilla Public License (MPL)
Update the Package Manager.
apt-get update && apt-get install -y gnupg2 wget
Add the Public Key of FreeSwitch package to local Package Manager.
wget -O - https://files.freeswitch.org/repo/deb/debian-release/fsstretch-archive-keyring.asc | apt-key add -
Add the FreeSwitch repository URL to the source list of local Package Manager.
echo "deb http://files.freeswitch.org/repo/deb/debian-release/ stretch main" > /etc/apt/sources.list.d/freeswitch.list
echo "deb-src http://files.freeswitch.org/repo/deb/debian-release/ stretch main" >> /etc/apt/sources.list.d/freeswitch.list
Install the FreeSwitch package.
apt-get update && apt-get install -y freeswitch-meta-all
make the folder structure
cd /usr/local
sudo mkdir freeswitch src
sudo chown -R `id -u`:`id -g` freeswitch src
use home brew to install dependencies
brew install autoconf automake curl ffmpeg jpeg ldns libpq libsndfile libtiff libtool lua openssl opus pcre pkg-config speex speexdsp sqlite yasm signalwire/homebrew-signalwire/flite signalwire/homebrew-signalwire/libks signalwire/homebrew-signalwire/signalwire-c
get the source code
/usr/local/src
FSfile=$(curl -s https://files.freeswitch.org/freeswitch-releases/ | grep -oE "freeswitch-[0-9]*\.[0-9]*\.[0-9]*\.-release\.tar\.bz2" | tail -n 1) && echo Downloading $FSfile && curl https://files.freeswitch.org/freeswitch-releases/$FSfile | tar -xj && mv ${FSfile/.tar.bz2//} freeswitch
git clone https://stash.freeswitch.org/scm/fs/freeswitch.git
run bootstrap
./bootstrap.sh
bootrap screen for fresswitch 
run configure
./configure
configure screen for fresswitch 
make text to soeech
perl -pi -e 's{#asr_tts/mod_flite}{asr_tts/mod_flite}' /usr/local/src/freeswitch/modules.conf
compile
make
make screen for fresswitch 
install
make install
install screen for fresswitch 
download and install sounds
make cd-sounds-install cd-moh-install
remove tenporary files that are not required afetr make
make clean
start freeswitch
cd /usr/local/freeswitch/bin
./freeswitch
run screen for fresswitch 
Viewing preset freeswitch variables by fs_cli eval $${variable}. Can view value of hostname local_ip_v4 local_mask_v4 local_ip_v6 switch_serial base_dir recordings_dir sound_prefix sounds_dir conf_dir log_dir run_dir db_dir mod_dir htdocs_dir script_dir temp_dir grammar_dir certs_dir storage_dir cache_dir core_uuid zrtp_enabled nat_public_addr nat_private_addr nat_type
Sofia is a SIP stack used by FreeSWITCH.
Reload all xml
sofia profile external rescan reloadxmlrecover calls that were up, after crashing (or other scenarios)
sofia recoversofis status
sofia status profile internal
=================================================================================================
Name internal
Domain Name N/A
Auto-NAT false
DBName sofia_reg_internal
Pres Hosts x.x.x.x,x.x.x.x
Dialplan XML
Context public
Challenge Realm auto_from
RTP-IP x.x.x.x
Ext-RTP-IP y.y.y.y
SIP-IP x.x.x.x
Ext-SIP-IP y.y.y.y
URL sip:mod_sofia@y.y.y.y:5060
BIND-URL sip:mod_sofia@y.y.y.y:5060;maddr=x.x.x.x;transport=udp,tcp
WS-BIND-URL sip:mod_sofia@x.x.x.x:5066;transport=ws
WSS-BIND-URL sips:mod_sofia@x.x.x.x:7443;transport=wss
HOLD-MUSIC local_stream://moh
OUTBOUND-PROXY N/A
CODECS IN PCMU,PCMA
CODECS OUT PCMU,PCMA
TEL-EVENT 101
DTMF-MODE rfc2833
CNG 13
SESSION-TO 0
MAX-DIALOG 0
NOMEDIA false
LATE-NEG true
PROXY-MEDIA false
ZRTP-PASSTHRU true
AGGRESSIVENAT false
CALLS-IN 0
FAILED-CALLS-IN 0
CALLS-OUT 0
FAILED-CALLS-OUT 0
REGISTRATIONS 0
Turn sip trace on on selected profile or global
>sofia profile internal siptrace on
Enabled sip debugging on internal
tcpdump
taking traffic dumps using tcpdump
> tcpdump -h
tcpdump version 4.9.2
libpcap version 1.5.3
OpenSSL 1.0.1f 6 Jan 2014
Usage: tcpdump [-aAbdDefhHIJKlLnNOpqStuUvxX#]
[ -B size ]
[ -c count ]
[ -C file_size ]
[ -E algo:secret ]
[ -F file ]
[ -G seconds ]
[ -i interface ]
[ -j tstamptype ]
[ -M secret ]
[ --number ]
[ -Q in|out|inout ]
[ -r file ]
[ -s snaplen ]
[ --time-stamp-precision precision ]
[ --immediate-mode ]
[ -T type ]
[ --version ]
[ -V file ]
[ -w file ]
[ -W filecount ]
[ -y datalinktype ]
[ -z postrotate-command ]
[ -Z user ]
[ expression ]
usage
tcpdump -s 0 udp port 5080 -w /home/ubuntu/fs_pbx1.pcap
ref