37820X Premium File
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- Last Update: Oct 2, 2026
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37820X, Avaya Midsize Solution Design, is a retired exam. Avaya introduced it in 2020 as the exam for the ACDS-3781 Avaya Midsize Solution Design certification, then retired both the credential and exam on August 30, 2024. Avaya explicitly replaced that design path with the ADRA-0008 Avaya IP Office Platform Design offering, earned through the 37611T Avaya IP Office Design Proficient Test. That transition is the most important fact for a 2026 reader.
The retired exam still provides a useful view of the design decisions midsize communications architects were expected to make. It centered on translating customer requirements into an Avaya midsize solution, especially around IP Office-era capabilities, user and endpoint needs, resiliency, networking, applications, licensing and solution sizing. Within Avaya certifications, 37820X should therefore be treated as historical design context, not a current booking target.
It also had a natural relationship with the sales-readiness side of the midsize portfolio. The older 46150T test focused on selling Avaya solutions to midsized customers, while 37820X focused on designing an appropriate technical solution. The two perspectives are related but not interchangeable: one frames customer value and qualification; the other turns validated requirements into an implementable architecture.
A strong solution design starts with business and operational requirements, not a product list. How many users are there? How many locations? Which users are mobile, remote or contact-center agents? What are the availability requirements? What existing telephony, network and carrier services must be retained? Which integrations are mandatory? Without those answers, product selection becomes guesswork.
For historical 37820X study, build a requirements matrix that separates mandatory needs from preferences. A customer may want a particular phone model but actually require survivable calling during a WAN failure. The architectural requirement should drive the design, and the chosen endpoint should support it. This habit prevents feature enthusiasm from replacing engineering.
Document constraints too. Budget, network readiness, cabling, power, site connectivity and support skills can all shape the design. An elegant architecture that depends on infrastructure the customer does not have is not a viable midsize solution.
Capacity planning is more than counting employees. Different user types consume different resources. Desk users, mobile workers, receptionists, contact-center agents and conferencing participants may need different licenses, devices and simultaneous-session capacity. A design should reflect actual usage patterns rather than assuming every named user has the same demand.
Peak behavior matters. A 300-user company may not have 300 concurrent external calls, but it could have concentrated traffic during sales campaigns, shift changes or incident response. Estimate busy-hour demand and include reasonable growth. Oversizing everything wastes budget; sizing only for today creates an early redesign.
Historical Avaya design work also required attention to platform limits and supported configurations. When using old exam material to understand a legacy environment, verify limits against the exact release documentation. Do not transfer an old capacity number into a modern design without checking it.
High availability is not one feature. A branch can lose WAN connectivity, a server can fail, power can be interrupted, a carrier path can become unavailable or a central service can be unreachable. The design should identify which failures matter and what level of service must continue through each one.
For every critical communication function, ask what it depends on. If remote phones depend entirely on a central service, what happens when the site loses connectivity? If inbound calls use one carrier path, what is the recovery plan? If voicemail or applications reside on a single system, is that acceptable to the business?
Resilience should be proportional to business impact. A small office may accept a manual workaround that a healthcare or emergency environment cannot. The exam-era design mindset rewarded candidates who could align technical redundancy with customer priorities rather than automatically choosing the most expensive architecture.
Unified communications depends on the data network. Latency, jitter, packet loss, bandwidth, VLAN design, QoS and power delivery can determine call quality as much as the communications platform itself. A designer should therefore review network readiness rather than assume an existing LAN is automatically suitable for voice and video.
Segmenting voice traffic can simplify QoS and troubleshooting, but the design still has to support routing, DHCP, DNS and security. Remote and branch connectivity adds WAN behavior, VPNs or edge traversal to the picture. If users report one-way audio or intermittent registration after deployment, the root cause may be network policy rather than telephony configuration.
A useful study exercise is to draw the packet path for an internal call, an external call and a remote-user session. Label every network service the communication relies on. That makes hidden dependencies visible before implementation.
Not every user needs the same device. Executives, receptionists, mobile employees, warehouse staff and contact-center agents have different interaction patterns. A design should match device features and client applications to those patterns without creating unnecessary model sprawl.
Applications deserve the same discipline. Voicemail, mobility, recording, collaboration, contact-center functionality and management tools each solve specific problems. Add them because a requirement justifies them, not because they appear in a product catalog. Every extra component adds licensing, configuration, security and support implications.
Standardization has value. If two endpoint models cover most users, supporting ten models simply for preference increases inventory and troubleshooting complexity. The best midsize design often balances user fit with operational simplicity.
Licensing is part of design because it determines which features are actually available to which users. A diagram can be technically perfect while the commercial configuration does not entitle the customer to the required capability. Historical certification work expected designers to connect technical features to licensing and offer structure.
When studying old material, avoid memorizing license names as if they were permanent. Avaya packaging has changed over time. Instead, practice the method: list required capabilities, map them to user groups, determine entitlement requirements and then confirm that the proposed commercial configuration covers every dependency.
This method also exposes unnecessary cost. If an advanced license is being assigned to every user because a small subset needs one feature, revisit the design. Commercial efficiency is part of a viable solution.
Communications systems carry sensitive conversations, credentials and administrative access. Design should include secure management, role separation, appropriate network controls, certificate and encryption requirements where supported, and a patching or maintenance model. Security cannot be bolted on after the deployment is complete.
Manageability matters just as much. Who will administer the system? How will configuration be backed up? How are alarms monitored? How will software updates be evaluated? A small customer with limited IT staff may need a simpler operational model than a larger organization with dedicated communications engineers.
Good design documentation records these operational assumptions. A diagram alone shows what is connected; it does not explain who owns the components or how the system is maintained.
Site topology also deserves explicit design work. A headquarters-and-branch organization may need centralized applications with local survivability, or it may need more independent sites because WAN outages are frequent. Draw both the normal traffic path and the degraded path. If a branch loses connectivity, which calls still work, which services disappear and how does the user know the system is in a fallback state? Those answers turn “resilience” from a marketing phrase into an operating design.
Interoperability should be validated at solution boundaries. Session border controllers, SIP providers, analog gateways, paging systems, door phones, fax devices and existing PBXs can all complicate an otherwise standard deployment. Record the protocol, codec, numbering and security assumptions for every boundary. If a third-party dependency is only “expected to work,” flag it for proof-of-concept testing instead of burying the uncertainty in the final proposal.
Finally, prepare an operational handoff, not just an installation diagram. The customer needs naming conventions, address and extension plans, license records, backup procedures, escalation contacts and a record of accepted design assumptions. A technically correct system without usable documentation becomes expensive to support as soon as the original project team leaves.
The 2024 retirement notice provides a clean transition: ACDS-3781 and exam 37820X ended on August 30, 2024, and Avaya introduced ADRA-0008 for IP Office Platform Design with the 37611T proficiency test. A current candidate should use that successor path rather than trying to locate a 37820X appointment.
The historical exam remains useful for legacy estates because requirements analysis, sizing, resilience, networking, endpoint selection, licensing and manageability are still core design disciplines. What changes are the products, versions, program rules and exact offer structure.
If an old job description asks for 37820X or ACDS-3781, interpret it as evidence that the role values Avaya midsize solution design experience. Then verify what current Avaya credential best represents that capability today. This preserves the intent of the old requirement without pretending the retired exam is still active.
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