AI and VoIP Blog

Author:

Akash Gupta | Sr. VoIP Engineer | MLOps

Real-time Transport Protocol (RTP) is a network protocol for delivering audio and video over IP networks. RTPEngine is a proxy for RTP streams that works in tandem with the SIP proxy like Kamailio. Integrating RTPEngine with Kamailio can provide a powerful platform for real-time communication. This article will guide you through the process of configuring RTPEngine in Kamailio using two different methods.

Prerequisites

Before you begin, ensure you have the following:

1. A Linux server (Ubuntu or CentOS)
2. Root or sudo access to the server
3. Kamailio and RTPEngine installed
4. Basic knowledge of Linux commands and SIP protocol

Method 1: Direct Configuration in Kamailio

The first method to configure RTPEngine in Kamailio is by directly setting the rtpengine_sock parameter in the Kamailio configuration file. This parameter specifies the socket (protocol, IP address and port) that Kamailio uses to send commands to RTPEngine.

Here’s how you can do it:

1. Open the Kamailio configuration file.
2. Load the rtpengine module by adding the following line to the configuration file:

loadmodule "rtpengine.so"

3. Set the rtpengine_sock parameter to the socket of your RTPengine node:

modparam("rtpengine", "rtpengine_sock", "udp:localhost:22222")

4. Save the configuration file and restart Kamailio:

systemctl restart kamailio

Method 2: Configuration from a Database

The second method to configure RTPengine in Kamailio is by loading the RTPengine node information from a database. This method is more flexible and scalable, especially if you have a dynamic set of RTPengine nodes that might change over time.

Here’s how you can do it:

1. Open the Kamailio configuration file (usually located at /etc/kamailio/kamailio.cfg).
2. Load the rtpengine module by adding the following line to the configuration file:

loadmodule "rtpengine.so"

3. Set the db_url parameters to your database URL. By setting this parameter database mode is activated (i.e. valid db_url):

modparam("rtpengine", "db_url", "mysql://user:password@localhost/database")

5. Save the configuration file and restart Kamailio:

systemctl restart kamailio

Conclusion

Configuring RTPEngine in Kamailio provides a robust solution for handling RTP streams in a SIP environment. Whether you choose to configure RTPEngine node directly in the Kamailio configuration file or load from a database depends on your specific requirements and system setup.

RTPEngine behavior can be controlled by using flags. To know more about flags and how they can be used refer to the official documentation of Kamailio here and RTPEngine here.
To install Kamailio from the source code check my blog post here and to install RTPEngine check the official documentation here.

Akash Gupta
Senior VoIP Engineer and AI Enthusiast

AI and VoIP Blog

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