(14.0) Pre-Requisites VRS HA

Before starting the HA deployment, make sure your setup complies with the prerequisites listed below.

Hardware requirements

For HA deployment, two VMs are required. Each machine should have the following hardware specifications. The two VMs will be referred by VM1 and VM2 in this guide.

	Minimum requirement
CPU	4 cores on each VM
RAM	4 GB on each VM
Disk	Here is a general formula for the calculation of disk space File Size = Duration(in seconds) * Sample rate * Bits per sample/8 * Number of channels. For example, if you have a recording that is 60 seconds long, uses the G.711 codec (which has a sample rate of 8 kHz and a bit depth of 16 bits), and is recorded in mono, the file size would be calculated as: File Size = 60 * 8000 * 16/8 * 1 = 768000 bytes Using this formula, disk space can be calculated for number of daily calls and retention period.
NICs	1 NIC per VM

Following are the prerequisites for setting up Voice recording solution under different deployment profiles.

Software Requirements
Host Operating System - Debian 10/11 Docker Community Edition 18+ Docker Compose v2.15.1 Git Client 1.8+
System Access Requirements
Administrative privileges (root) on the host machine are required to proceed with installation.

Time Synchronisation

Communication packets between Voice Recording solution, Cisco CUCM, Cisco IP Phones (BIB enabled) carry timestamps. If the systems' date and time are not synchronized the system can produce unpredictable results. Therefore, please make sure to adhere to the following time synchronization guidelines:

Voice Recording solution, Cisco CUCM, Cisco IP Phones (BIB enabled) should have their Time-Zone and time configured properly according to the geographic region and should be synchronized. To configure the time zone, please see the instructions from the hardware or software manufacturer of NTP server. Voice Recording solution and Cisco CUCM should be synchronized to the second. This synchronization should be maintained continuously and validated on a regular basis. For security reasons, Network Time Protocol (NTP) V 4.1+ is recommended.

Port Utilization

The ports mentioned in this section must be open to install the product.

	Source Host	Destination Host / Docker Container	Source Port	Destination Port	Communication Protocol	Scope	Description
1	VRS Host	ExpertFlow GitLab	any	443	HTTPS	public	to clone skeleton project from Gitlab
2	VRS Host	Expertflow Container Registry	any	9242	TCP	public	to clone the repository from a local gitlab over this port.

For Product connectivity with internal and external components

Ports mentioned in this section should be open for the mentioned product connectivity with different internal and external components.

	Source Host	Destination Host / Docker Container	Source Port	Destination Port	Communication Protocol	Scope	Description
1	CUCM	VRS	any	5060	TCP	public	This port will be used by CUCM to send SIP events to recording solution. This port is opened by SIP Server in recording solution.
2	Any	VRS	any	443	HTTP	public	To access VRS UI
3	any	VRS	any	8088	HTTP	public	To access VRS Keycloak (Identity and Access Management module)
4	Voice gateway	VRS	any	16386-32768	UDP		Range of UDP ports to be used for voice packets streaming from Voice gateway to recording solution.