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Avaya 37820X: Midsize Solution Design and Its Successor

37820X was the Avaya Midsize Solution Design Exam for the ACDS-3781 Avaya Midsize Solutions Design credential. It is retired. Avaya Learning announced that ACDS-3781 and exam 37820X would retire on August 30, 2024, the final registration and delivery date at Pearson VUE. The change was not a dead end: Avaya introduced ADRA-0008, Avaya IP Office Platform Design, earned through the 37611T Avaya IP Office Design Proficient Test.

That transition is the most important fact for anyone arriving at the 37820X code in 2026. Old question catalogs may still present it as available, but Avaya’s own transition notice establishes the retirement date and names the replacement offering. The historical exam is therefore best read as a record of the design decisions Avaya expected solution designers to make around its midsize portfolio.

Within the broader set of Avaya credentials, 37820X represented a design role rather than an implementation or support role. A designer had to translate business requirements into an architecture that could be sized, licensed, connected, protected, and operated. Current IP Office documentation still makes those design disciplines visible even though the credential code has changed.

Midsize solution design began with requirements, not product selection

A credible communications design starts by describing the organization. How many users and sites are involved? Which locations need local survivability? What calling patterns exist between sites and to external networks? Which users are mobile or remote? Are contact-center capabilities required? What growth, recording, messaging, or business-continuity expectations must the solution support? Product components should be chosen only after these requirements are understood.

This requirement-first approach prevents a common design mistake: selecting a familiar topology and then forcing the customer into it. Two businesses with the same user count can need very different systems if one is a single office and the other has dozens of branches, unreliable WAN links, heavy SIP traffic, or regulated recording. The exam’s design orientation was fundamentally about recognizing those differences.

A useful study method is to turn every scenario into a requirements table before thinking about an answer. Separate capacity, availability, connectivity, user experience, applications, security, and operational ownership. Then identify which requirements constrain the architecture. This exposes tradeoffs and reduces the temptation to choose a component merely because it appears in the scenario.

IP Office architecture had to fit the scale and deployment model

Avaya IP Office can be deployed in several forms, from smaller local systems to Server Edition networks with primary, secondary, and expansion systems. Current Avaya documentation describes IP Office as a modular communications platform that can support thousands of extensions and many sites in a multisite network. The correct design depends on both present demand and how the customer expects the environment to grow.

A designer needs to distinguish roles within the architecture. A primary server can provide core services, a secondary server can add resilience, and expansion systems can support local phones and trunks at additional locations. Application services such as voicemail and user applications also consume resources and may influence server placement. Understanding the role of each component is more important than memorizing one reference diagram.

Topology decisions should also account for management. A technically possible design may be unnecessarily difficult to operate if configuration is fragmented, dependencies are obscure, or every branch requires unique treatment. Standardized site patterns can simplify deployment and support, provided they still meet local requirements.

Capacity planning required several limits to be evaluated together

User count alone does not size an IP Office solution. Avaya’s capacity guidance calls out extensions, sites or nodes, trunks, hunt groups, concurrent VoIP calls, media paths, conferences, recording, network links, call destinations, QoS, traffic profiles, resilience, and licensing. One resource can become the practical limit before another headline capacity is reached.

This is why scenario-based design matters. A branch with many registered users but little simultaneous call traffic has a different capacity profile from a contact-intensive site with recording and conferencing. A multisite environment can also shift media or signaling across WAN links, so network capacity must be considered with telephony capacity instead of as a separate afterthought.

Design practice should include a margin for growth and failure conditions. If a secondary system must absorb users after a failure, it needs enough capacity for that state. If trunks fail over to another route, the alternate route must be able to carry the expected load. A design that works only when every component is healthy is not a resilient design.

Trunks, SIP, and the network formed one design problem

Modern telephony depends on the data network. SIP trunks, IP endpoints, WAN paths, session control, NAT behavior, security boundaries, and quality of service can all influence whether calls establish and whether media quality remains acceptable. Avaya’s IP Office documentation emphasizes network assessment for VoIP because signaling success alone does not guarantee a usable conversation.

A designer should understand where signaling travels and where media travels. Those paths may not be identical, especially in multisite or centralized environments. Firewalls, session border controls, bandwidth limits, and routing policies need to accommodate the actual traffic pattern. The goal is not to make every candidate a network architect, but to ensure that the voice design is not isolated from network reality.

Trunk sizing should follow call demand and business continuity requirements. A customer may need enough sessions for ordinary busy-hour traffic plus headroom, or may accept constrained service during failover. Alternate routing can protect against a carrier or path outage, but it must be designed intentionally; simply having a second trunk does not guarantee that calls will use it correctly.

Endpoints and user experience had to match the workforce

A midsize solution can serve desk-based users, remote workers, mobile staff, shared spaces, reception functions, and specialist teams. Those groups may require different endpoint capabilities and application access. Choosing a device or client only by price can create friction when the user’s calling, conferencing, mobility, or feature requirements are not met.

Designers also need to understand where user services are anchored. In branch scenarios, some users can be local to IP Office while others interact with centralized Avaya Aura services. Avaya documentation describes centralized branch models in which endpoints normally register to central services and can fail over locally under specified conditions. That changes both network dependency and survivability behavior.

User design should therefore be tested through real tasks: place and receive calls, transfer, conference, retrieve messages, work remotely, and continue operating when a WAN or server component is unavailable. These use cases connect technical architecture to the experience the customer actually purchases.

Resilience had to be designed before a failure occurred

Current IP Office Server Edition documentation describes resilience for servers, users, hunt groups, voicemail, endpoints, trunks, incoming routes, and management in supported designs. The important design lesson is that resilience is not one checkbox. Different services can have different failover mechanisms, and the designer must know which business functions need to continue during each failure scenario.

A secondary server can protect services provided by the primary, while multisite topology can provide alternate paths and backup locations. Branch designs can also preserve local capability when connectivity to centralized systems is lost. These options have value only when capacity, routing, licensing, and operational procedures support them.

Practice should include explicit failure questions. What happens if the primary server is unavailable? What if the WAN between a branch and the center fails? Can users still make internal or external calls? Which voicemail or application features remain? How is configuration reconciled after recovery? A design answer is stronger when it describes behavior during failure rather than simply listing redundant components.

Applications and contact-center features changed the sizing equation

Midsize communications solutions often include more than basic telephony. Voicemail, portals, collaboration, recording, hunt groups, and contact-center functions can add processing, storage, licensing, network, and resiliency requirements. The design should identify which applications are business-critical and whether they need the same availability target as core calling.

Contact-center requirements deserve special attention because traffic patterns, agent workflows, queue behavior, reporting, and recording can differ from ordinary office calling. A customer may describe the need simply as “a support line,” but the actual requirement could include skill-based distribution, supervisor visibility, overflow, after-hours treatment, and historical reporting. Those needs should be discovered before the architecture is finalized.

Integration can also determine placement. A service that relies on a database, identity system, email server, recording platform, or central Avaya component creates dependencies outside the IP Office system itself. The designer should document those dependencies so implementation and support teams understand what must be available for the complete solution to function.

Licensing and commercial fit were part of a valid technical design

A design cannot be considered complete if the required capabilities are not licensed. IP Office licensing can vary by deployment model, user capability, trunking, applications, and release. Historical 37820X candidates therefore needed to connect technical choices with the commercial structure of the solution rather than assuming every feature was automatically available.

The same principle applies today even though specific licenses and programs evolve. Confirm the current entitlement model for the chosen release, verify that branch or centralized functions have the necessary licenses, and avoid basing a design on an obsolete part number found in old study material. Licensing is one of the areas where historical exam content ages faster than architecture principles.

Commercial fit also includes operational cost. A resilient multi-server design may provide excellent availability but be unnecessary for a small single-site customer with a different risk tolerance. Conversely, removing redundancy to reduce acquisition cost can be false economy for a business that depends on uninterrupted customer communications. The designer’s role is to make those tradeoffs explicit.

The 2024 transition moved the credential, not the design discipline

Avaya’s transition notice states that ACDS-3781 and 37820X retired on August 30, 2024, while the new ADRA-0008 Avaya IP Office Platform Design offering is earned through the 37611T proficient test. That is the correct successor relationship to preserve when explaining the old code. A candidate in 2026 should not schedule 37820X.

Historical 37820X material can still be useful when it teaches requirements analysis, sizing, topology, network dependency, resilience, application fit, and licensing. It becomes risky when it presents old product versions, part numbers, capacities, or program rules as current. Current IP Office documentation should be used to validate those implementation-specific facts.

The durable study objective is to defend a design. Given a customer scenario, explain why the selected topology fits the scale, how traffic and trunks are sized, where resilience comes from, what happens during failures, which applications are dependencies, and how the solution can be operated. That reasoning survives the retirement of 37820X and aligns naturally with the successor IP Office design focus.

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