Install RTPProxy On CentOS 7

sachin

What is RTPProxy

RTPProxy is a software application that serves as a middleman between two endpoints of a real-time media stream, typically for VoIP (Voice over Internet Protocol) traffic. It is used to improve the quality and reliability of VoIP calls, especially in situations where there are network address translation (NAT) devices or firewalls between the endpoints.

Here's how RTPProxy works:

1. RTP (Real-time Transport Protocol) packets are sent between two endpoints in a VoIP call.
2. These packets are intercepted by the RTPProxy server, which sits between the two endpoints.
3. The RTPProxy server then modifies the packets to include its own IP address and port number, replacing the IP address and port number of the originating endpoint.
4. The modified packets are then sent to the other endpoint.
5. When the other endpoint receives the packets, it sends a response back to the RTPProxy server.
6. The RTPProxy server then modifies the response packets to remove its own IP address and port number, replacing them with the IP address and port number of the originating endpoint.
7. The modified response packets are then sent back to the originating endpoint.

By using RTPProxy, VoIP traffic can be reliably and efficiently transmitted even when there are NAT devices or firewalls between the endpoints. It can also help reduce latency and packet loss, leading to improved call quality. RTPProxy is often used in conjunction with other VoIP protocols and technologies, such as SIP (Session Initiation Protocol) and Asterisk, an open source PBX (Private Branch Exchange) system.

What is NAT

NAT stands for Network Address Translation, which is a method used by routers to allow multiple devices on a local network to share a single public IP address. NAT works by translating the private IP addresses used on a local network into a single public IP address that is used to communicate with devices outside the local network.

In a NAT environment, the router assigns a unique private IP address to each device on the local network. When a device on the local network wants to communicate with a device outside the local network (such as a server on the Internet), the router translates the private IP address of the local device into the public IP address assigned to the router. The router then forwards the communication to the external device.

NAT can provide security benefits by hiding the private IP addresses of devices on a local network from the public Internet. However, NAT can also introduce limitations and complications for certain types of network communications, such as peer-to-peer networking, VoIP, and some online gaming. To address these limitations, specialized protocols and technologies, such as UPnP (Universal Plug and Play) and STUN (Session Traversal Utilities for NAT), have been developed to help devices behind NAT to communicate with each other more easily.

Install RTPProxy on CentOS 7 Linux server using steps provided below:

sudo yum -y install centos-release-scl
sudo yum -y install devtoolset-7-gcc devtoolset-7-gcc-c++ devtoolset-7-binutils
scl enable devtoolset-7 bash

Confirm version of GCC:

$ gcc --version
gcc (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5)
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Install RTPProxy

yum install rtpproxy

Edit sudo vi /etc/sysconfig/rtpproxy and add following content  (Optional)

$ sudo vi /etc/sysconfig/rtpproxy
OPTIONS="-F -s udp:127.0.0.1:7722 -A 192.168.1.60"

Rtpproxy will listen on ip: 192.168.1.60 , control socket being unix:/var/run/rtpproxy.sock.

Reload and start rtpproxy

sudo systemctl daemon-reload
sudo systemctl start rtpproxy