Rescomm is a turn-key telephony SaaS solution ready for public or private cloud deployment. Restcomm is compatible with Twilio API’s and is part of the Restcomm open source Community. Here is the Restcomm Open Source community github page.

This tutorial will guide you through the steps required to install and run Restcomm on Google Cloud Compute Engine.


  • Basic Knowledge of Telscale Restcomm or Mobicents Restcomm

  • Google Cloud Compute Engine as explained HERE

  • Java JDK 7 or higher as explained HERE

  • Install screen (yum install screen)

  • Minimum compute engine "Machine-type" g1-small (1 vCPU, 1.7 GB memory) On a production server, increase the machine type to account for higher traffic.

Initial Setup and Installing Restcomm

  • ssh into your google cloud compute instance

  • install "screen"

    • yum install screen

  • Download Java

    • download java jdk to the /opt directory of your install as follows

    • wget --no-cookies --no-check-certificate --header "Cookie:; oraclelicense=accept-securebackup-cookie" ""

    • extract the content of the file to the /opt directory as follows

    • tar xzf jdk-7u79-linux-x64.tar.gz

    • point the java command to the correct directory with the following command

    • alternatives --config java

  • open firewall ports for Restcomm http traffic and RTP traffic

    • from the ssh terminal run the following command

    • gcloud compute firewall-rules update restcomm-rules --allow tcp:444 tcp:8080 tcp:8000 tcp:2080 udp:5060 udp:5061 udp:5080 udp:34534-65535

    • these are some of the essential ports for SIP, RTP traffic.

  • download  Mobicents Restcomm

Configure and Start Restcomm

  • go to the directory mobicents-Restcomm-JBoss-AS7-

  • edit the file restcomm.conf file with the info from you google compute instance

  • run the command ifconfig to get your local network details

  • run the command gcloud compute instances list to get the Public IP Address

  • go to to get a free API account

  • fill out the restcomm.conf file as follows

    # Network configuration
    # VoiceRSS variable declarations

Start and Use Restcomm

  • run the start script in the directory mobicents-Restcomm-JBoss-AS7-

  • ./

  • on your web browser go to the url


  • log into the Restcomm instance with

  • password=RestComm

  • You will be prompted to change the default password.


Making SIP Calls to Restcomm

  • Start a SIP phone and make a call to sip:1234@

  • Make another call to sip:1235@