Question

we have a freeswitch on AWS cloud and we would like to dial @ 1000CPS what are the methods to achieve this requirement

Answer 1

To achieve a call rate of 1000 calls per second (CPS) with FreeSWITCH on AWS cloud, you'll need to consider several factors including instance type, network configuration, and FreeSWITCH optimization. Here are some methods to help you achieve this requirement:

Choose the Right Instance Type: Select an AWS EC2 instance type that offers high network performance and CPU resources. Instances such as c5, m5, or r5 with high network bandwidth and vCPUs would be suitable for handling high call volumes.
Network Configuration: Optimize your AWS VPC and subnet configurations to minimize latency and maximize throughput. Ensure that your FreeSWITCH instance is placed in a subnet with sufficient bandwidth and low latency to handle the desired call rate.
Vertical Scaling: Increase the instance size (vertical scaling) of your FreeSWITCH server to handle higher call volumes. This involves upgrading to a larger instance type with more CPU cores and memory to support increased processing demands.
Horizontal Scaling: Distribute the call load across multiple FreeSWITCH instances by setting up a load balancer or using a clustered deployment. This allows you to scale out horizontally to handle higher call volumes by adding more instances as needed.
Optimize FreeSWITCH Configuration: Fine-tune the FreeSWITCH configuration settings to optimize performance for high call volumes. This may include adjusting parameters such as max sessions, worker threads, and SIP timeouts to handle the desired CPS.
Media Optimization: Offload media processing tasks such as transcoding and recording to separate instances or services to reduce the load on the FreeSWITCH servers and improve overall performance.
Monitoring and Optimization: Monitor system performance metrics such as CPU utilization, memory usage, and network throughput to identify bottlenecks and optimize system configuration accordingly. Use tools like AWS CloudWatch to gain insights into system performance and make necessary adjustments.
Capacity Planning: Conduct thorough capacity planning to ensure that your AWS infrastructure is capable of supporting the desired call rate under peak load conditions. Consider factors such as expected call volume fluctuations and growth projections when designing your infrastructure.

By implementing these methods and continuously monitoring and optimizing your AWS infrastructure and FreeSWITCH configuration, you can achieve a call rate of 1000 CPS and ensure reliable performance for your VoIP application.

Answer 2

Horizontal scaling involves distributing the load across multiple instances of FreeSWITCH to handle higher call volumes. Here's a step-by-step guide to help you achieve horizontal scaling for FreeSWITCH on AWS:

Set up a Load Balancer:

• Create an Elastic Load Balancer (ELB) or use an Application Load Balancer (ALB) in front of your FreeSWITCH instances. This load balancer will distribute incoming SIP traffic across multiple FreeSWITCH servers.
• Configure the load balancer to perform health checks on the FreeSWITCH instances to ensure they are responsive and able to handle incoming calls.

Deploy Multiple FreeSWITCH Instances:

• Launch multiple EC2 instances, each running an instance of FreeSWITCH. You can use the same Amazon Machine Image (AMI) for all instances or customize the configuration as needed.

• Ensure that each FreeSWITCH instance is configured to handle SIP traffic and is accessible over the network.

Configure FreeSWITCH for Clustering:

• Enable clustering support in FreeSWITCH to allow multiple instances to work together seamlessly. You can use techniques such as mod_cluechoo to synchronize call state between instances.

• Configure each FreeSWITCH instance with the necessary clustering parameters to ensure they can communicate and share call state information.

Distribute SIP Traffic:

• Update your SIP trunk configuration to point to the DNS name or IP address of the load balancer instead of individual FreeSWITCH instances.
• Configure the load balancer to distribute incoming SIP traffic evenly across all FreeSWITCH instances. This ensures that calls are load balanced across the cluster.

Monitoring and Auto Scaling:

• Monitor the performance of your FreeSWITCH instances and the overall cluster using AWS CloudWatch metrics and alarms.
• Set up auto-scaling policies to automatically add or remove FreeSWITCH instances based on predefined thresholds such as CPU utilization or network traffic.
• Ensure that the auto-scaling policies are configured to scale the cluster up or down dynamically based on the current call volume and system load.

High Availability and Fault Tolerance:

• Implement redundancy and failover mechanisms to ensure high availability and fault tolerance for your FreeSWITCH cluster.

• Spread your FreeSWITCH instances across multiple Availability Zones (AZs) to minimize the impact of AZ failures on your service availability.

• Configure the load balancer with appropriate failover settings to redirect traffic to healthy instances in case of failures.

By following these steps, you can achieve horizontal scaling for FreeSWITCH on AWS, allowing you to handle higher call volumes and ensure high availability and reliability for your VoIP application.