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Avaya to Five9 Contact Center Migration: A Step-by-Step Guide
A step-by-step Avaya to Five9 migration guide: when to move, key benefits, a 9-step plan, common pitfalls, and how to hit zero downtime.

Avaya to Five9 Contact Center Migration: A Step-by-Step Guide

4 mins
July 3, 2026
Author
Kapildev Arulmozhi
TL;DR
  • Teams leave Avaya for the same reasons: high maintenance overhead, no elastic scale, and clunky remote-agent support. Five9's cloud-native model rolls out upgrades and compliance patches automatically in the background.
  • Success is not "moving phone lines to the cloud." It follows a structured nine-step path, from audit and sandbox design through integrations, testing, phased go-live, and decommission.
  • The two biggest killers are shallow discovery of custom IVRs and integrations, and blindly cloning Avaya call flows instead of redesigning for Five9. Inventory every dependency first, then rebuild for the cloud.
  • A phased go-live that keeps Avaya as a fallback, plus careful number porting, is what delivers zero downtime. A typical Avaya to Five9 migration runs 6 to 12 weeks.
  • What if your contact center’s technology looks more like a museum rather than a launchpad? Obviously, you will lose your market share. No doubt that Avaya has served as the backbone of telephony infrastructure with complex hybrid patches and on-premises architectures. 

    Shifting your operations to Five9’s Contact Center as a Service (CCaaS) platform lifts the infrastructure burden entirely off your team’s shoulders. With a true cloud-native platform, version upgrades and compliance patches roll out automatically in the background. 

    In this blog, we will see an overview of the Avaya to Five9 migration with minimal disruption.

    Table of Contents

      When to Consider Migrating from Avaya to Five9?

      Contact centers have relied on Avaya over the years. But when it comes to customer service, remote teams, reduction in infrastructure costs, and support for AI automation, businesses are looking for a change to a cloud-native contact center platform - Five9. The main reasons are 

      • Maintenance costs: Avaya consumes valuable IT resources. Expertise teams must handle software updates, hardware maintenance, security patches, and system availability. Moving to Five9 will reduce maintenance costs and operational overhead.
      • Scalability: Contact centers need to evolve as organizations grow. Avaya does not offer scalability. Five9 offers the flexibility to scale capacity on demand.
      • Remote or Hybrid Work: When supporting remote agents becomes complex due to VPNs and on-premises dependencies, Avaya does not provide a seamless user experience.
      • Increased customer expectation: Avaya has many disadvantages like long wait times, inconsistent service across channels, and limited self-service options. All these, in turn, result in no longer meeting customer expectations.
      • Availability and Business Continuity Are Important: For those interested in gaining more availability, more redundancy, and a better way to deal with disasters, migrating to a cloud-native contact center is usually considered.
      • Modernization: If there is any modernization happening within the organization, such as digital transformation and new customer experience strategy implementation, then the move from Avaya to Five9 helps with that.

      Benefits of Migrating from Avaya to Five9 Contact Center

      Migrating from an on-premises solution like Avaya to a cloud-native platform like Five9 can give us numerous benefits. Some of the key benefits of migrating from Avaya to Five9 Contact Center are 

      • Insights for Productivity and Performance: Five9’s dashboard allows for real-time insights into agent performance, customer satisfaction, and overall contact center efficiency. By leveraging these insights, management will be able to detect patterns and optimize their operations.
      • Quick Innovations: Five9 enables continuous innovations such as features, security updates, and AI integration through automatic cloud upgrades. Organizations benefit from the latest innovations without any delays or service disruptions.
      • Customer Experience Upgrade: The Five9 platform enables organizations to provide their clients with rapid and customized communication across channels such as voice, chat, email, SMS, and social media. The use of call routing, virtual assistants, and self-service helps organizations to make sure that their clients communicate with the right person within minimal time periods.
      • Omnichannel Customer Experience: Voice, email, web chat, and SMS were usually handled as isolated forms of communication before. Five9 unifies all these channels into one single workspace. In this manner, there is a continuous stream of communication, where customers do not need to repeat themselves while switching between modes of conversation.
      • Improved Reliability: Cloud-based infrastructure provides built-in redundancy and disaster recovery capabilities. Five9 continues to provide support even during local outages or unexpected disruptions.

      Step-by-Step Plan for Your Avaya to Five9 Contact Center Migration

      Migrating from the legacy Avaya platform to a cloud-native powerhouse like Five9 is a major milestone for handling customer expectations. However, a successful transition isn’t just moving the phone lines to the cloud; it is more about a structured, deliberate approach that gives zero downtime and minimal disruption to daily operations.

      Step 1: Audit and Architectural Analysis

      Before starting your migration, you first need to analyze the things in the existing environment. Document your current physical server architectures, public switched telephone network (PSTN) connections, trunk lines, and phone carrier contracts. 

      Document your active Interactive Voice Response (IVR) call flows, skill queries, and automatic call distribution (ACD) rules. In this step, identify dead-end queries and simplify complex menus. The key deliverables are infrastructure inventory, application dependencies, integration map, migration scope, and risk assessment.

      Step 2: Define Business and Technical Requirements

      In this stage, prepare a precise blueprint of the present processes. Identify how your voice channel connections, emails, SMS messages, and live chat would flow into the unified Five9 agent desktop. State how it measures up to success criteria like better customer satisfaction, work from home, cost savings, or artificial intelligence-driven automation. 

      Plug in your CRM system (e.g., Salesforce, ServiceNow, or HubSpot). Set up the configuration so that customer information pops up on the spot as soon as an agent is called by the customer.

      Step 3: Design the configurations

      This is where your new cloud contact center comes to life. System engineers build out the infrastructure in a secure sandbox environment, keeping it completely separated from your active Avaya production lines. 

      Make sure that your Five9 environment fits into your current business processes by utilizing all cloud-based features. Update your call flows, call routing, IVRs, queues, user access levels, and other aspects. This is also the perfect opportunity for you to simplify all workflows that have become too complicated over time.

      Step 4: Migrate Integrations and Data

      Construct user profiles, allocate agent skills to each individual, and replicate your new queuing system in the cloud. Connect Five9 with the CRM, identity management platform, workforce management software, analytics software, and other enterprise applications. Import important configuration data to guarantee that customer data and reporting will continue functioning correctly.

      Step 5: Testing

      Conduct User Acceptance Testing inside the sandbox. Test all end-to-end scenarios, including inbound and outbound voice clarity, automatic CRM record updates, and correct routing on agent skill designations. 

      Step 6: Training and Workforce Readiness

      A migration is considered successful only when users start using it without regression. Provide dedicated, hands-on training tailored specifically to each team member, such as agents, supervisors, administrators, and IT teams. Making the team members familiar with the Five9 interface and workflows helps reduce productivity loss.

      Step 7: Phased Go-Live

      Begin by moving a small, low-risk pilot group or a single department over to Five9 first. Keep your remaining teams active on Avaya to serve as an immediate fallback safety net. Work together with your telecom provider to make sure that all of your phone numbers migrate over to the Five9 system successfully.

      Step 8: Continuous Optimization

      It’s only the beginning of the journey. Check out your key performance indicators – for example, your handle time, your resolution rate, your customer satisfaction levels, and your agent productivity. Utilize the Five9 analytics and AI capabilities to optimize your strategies for call routing and workforce management.

      Step 9: Decommission 

      Once your entire organization is successfully running on the cloud and metrics have stabilized, safely power down and decommission your legacy Avaya servers and hardware leases.

      Open Popup

      Common Issues in an Avaya to Five9 Contact Center Migration

      Any migration will come with a lot of challenges. Most issues come from planning, integration, and adoption. Some of the common challenges in an Avaya to Five9 Contact Center migration are

      • Improper Assessment: The most common migration issue is not properly assessing the Avaya environment. Enterprises often overlook custom call flows, IVRs, routing, third-party integrations, or legacy configurations. To overcome this, conduct a comprehensive phase to inventory all applications, integrations, workflows, and dependencies before migrating to Five9.
      • Complex Call Flows: Avaya and Five9 have different ways of routing calls and managing IVRs. Blindly duplicating current systems will not necessarily result in achieving the customer experience you want. To avoid it, redesign your workflows by using Five9's cloud-first nature rather than replicating old methods. 
      • Integration Challenges: Most contact centers use CRM solutions, WFM solutions, analytical platforms, identity providers, and custom applications. Poor integration can disrupt the workflow of agents and decrease their efficiency. To overcome these, identify all the integrations at the starting stage by ensuring API compatibility and testing all the integrated applications.
      • Data Migration: Previous call recordings, user configurations, and performance dashboards may not transfer directly between platforms. Without proper planning, this may result in losing valuable insights. To mitigate this, make a clear roadmap of what to migrate, what to archive, and what to recreate before implementation.
      • Downtime: Transferring phone numbers, routing configurations, and production workloads may introduce a service downtime. To avoid this, use a phased approach for migration wherever possible and schedule downtime when the traffic is low.

      Partner with Entrans for Your Avaya to Five9 Contact Center Migration

      Migrating to Five9 is an opportunity to modernize your contact center for better customer experiences. Partnering with a migration expert like Entrans will give you a team of experts that can manage every stage of the migration. 

      • We completely optimize your data flow, slashing deployment lag times up to 50% so you can start capitalizing on Five9’s advanced capabilities on day one.
      • Our professionals work to lower migration risks, cut downtime, and speed up the process of integrating the cloud and AI solutions of Five9.
      • We are here to become the safety net that guarantees you an easy migration, transparency, and full alignment with the operations of your team.

      Want to know more about it? Book a consultation call with us!

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      Frequently Asked Questions (FAQs)

      1. How long does it take to migrate to Five9?

      Avaya to Five9 migration depends on contact center size, integrations, and customizations. A typical migration takes 6 to 12 weeks to complete.

      2. What happens to our existing Avaya equipment and licenses?

      Avaya hardware can be decommissioned once the cloud transition is complete. Your Avaya licenses will run till their current contract term expires without any renewal.

      3. Will there be downtime during the Avaya-to-Five9 migration?

      No. We can avoid downtime during the migration through proper planning. Business continuity is often maintained by most organizations.

      4. Can we retain the existing phone numbers from the Avaya environment?

      Yes. Existing phone numbers can be ported to Five9 without interruption.

      5. Can we migrate all the Avaya components to Five9?

      While core functionalities like voice routing, IVR menus, and agent skills map directly to Five9, physical hardware and legacy local database setups cannot be transferred. Some components need redesigning in Five9.

      6. Is Five9 suitable for remote and hybrid contact center teams?

      Yes. Five9 is a cloud-based application that permits agents to connect to the contact center from any location as long as they have a web browser.

      Hire Five9 Migration Engineers
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      Kapildev Arulmozhi
      Author
      Kapil is the Co-founder and CMO of Entrans, bringing over 20 years of experience in SaaS sales and related industries. He is responsible for creating and overseeing the revenue-driving systems at Entrans. Having collaborated extensively with tech leaders and teams, Kapil possesses a keen understanding of the decision criteria and ROI-justifiable initiatives essential for business growth.

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