Motivation: I've found only one working script for sending multifon SMS: https://github.com/vir/yate/wiki/Multifon-sms The main problem is it's based on heavy project YATE. It was need simpler solution. Thanks: To author of YATE multifon-sms script for information about specific headers. 1.Install patched version of sipsak git clone https://github.com/wolandtel/sipsak.git cd sipsak debuild -b -uc -us cd .. sudo dpkg -i sipsak_*-fox-*.deb 2. Copy sms.conf.sample to sms.conf and fill it with your phone number and multifon password 3. Send message ./sms.sh 79aabbccddd "test message" ./sms.sh 79aabbccddd "$(echo -en "Multiline\ntest message")" ./sms.sh 79aabbccddd "$(echo -en "Тестовое сообщение\nв несколько строк")" 4. Debugging add line DEBUG=1 to sms.conf it's recomended to add '> sms.log 2> sms.err' to messsage command line while debug enabled 5. Troubleshooting If you receive 403 Forbidden: 1. Check your credentials 2. Enable debugging and look at Via: header of sending message. If it contains 10.x.x.x, 192.168.x.x, 172.16.x.x – 172.31.x.x, you have NAT and unroutable address on your interface. It's impossible to send SMS in such environment now. !!Message contents MUST be UTF-8 endoded.