Five9 UC Integrations

Name: Five9 UC Integrations
Brand: Five9
Rating: 4 (2720 reviews)

Leader

The New CX Starts Here. Transformed by AI, Powered by Five9.

Est 2001|Valuation $2.5B|Raised $204.3M

LinkedIn 126K|Website|Web traffic 5.0M|FTEs 2,910|HQ San Ramon, California, US

MarketsContact Center as a Service (CCaaS)

Published May 16, 2026

01Common complaints

If the primary need is basic call queues and a simple IVR without enterprise CCaaS capabilities, lighter-weight or UC-native contact center options may be simpler and less costly.
If the primary concern is call reliability or audio quality and pilot testing reveals instability, alternative products or architectures should be considered; network engineering and QoS validation are recommended before proceeding.
If transparent, self-serve pricing and minimal professional services are essential, note that Five9 commonly uses quote-based pricing and bundling.
If the organization requires definitive, out-of-the-box presence behaviors for Teams or other UC platforms and cannot verify integration depth in a proof-of-concept, pursuit of Five9 UC integrations should be contingent on a successful technical validation.

- If the primary need is basic call queues and a simple IVR without enterprise CCaaS capabilities, lighter-weight or UC-native contact center options may be simpler and less costly. - If the primary concern is call reliability or audio quality and pilot testing reveals instability, alternative products or architectures should be considered; network engineering and QoS validation are recommended before proceeding. - If transparent, self-serve pricing and minimal professional services are essential, note that Five9 commonly uses quote-based pricing and bundling. - If the organization requires definitive, out-of-the-box presence behaviors for Teams or other UC platforms and cannot verify integration depth in a proof-of-concept, pursuit of Five9 UC integrations should be contingent on a successful technical validation.

Disqualifying conditions (poor fit)

Requirement for guaranteed deep bidirectional presence behaviors across all clients without an opportunity to validate via proof-of-concept.
Environments that cannot meet technical requirements (e.g., highly restricted browsers, unsupported VDI configurations).
Agents who operate over persistently unstable last-mile networks where QoS cannot be controlled.

Known issues from community (operational)

Community posts report web platform instability and audio issues; these reports are not always specific to UC integrations but can affect collaboration workflows. https://www.reddit.com/r/callcentres/comments/1b98xch
Outage complaints exist and can impact availability assessments. https://www.reddit.com/r/sysadmin/comments/103b8mq

- Community posts report web platform instability and audio issues; these reports are not always specific to UC integrations but can affect collaboration workflows. https://www.reddit.com/r/callcentres/comments/1b98xch - Outage complaints exist and can impact availability assessments. https://www.reddit.com/r/sysadmin/comments/103b8mq

Limitations implied by documentation patterns

UC adapters may include limits and administrative constraints (e.g., import limits, directory behaviors) referenced in the UC adapters administrator guide; details require deeper documentation review.
- UC adapters administrator guide: https://documentation-be.five9.com/bundle/uc-adapters-administrators-guide/raw/resource/enus/uc-adapters-administrators-guide.pdf

- UC adapters may include limits and administrative constraints (e.g., import limits, directory behaviors) referenced in the UC adapters administrator guide; details require deeper documentation review. - UC adapters administrator guide: https://documentation-be.five9.com/bundle/uc-adapters-administrators-guide/raw/resource/enus/uc-adapters-administrators-guide.pdf

Roadmap and feature timing

Release notes indicate ongoing changes that include UC adapters among other components; organizations should plan for change-control and revalidation after major releases. https://documentation-be.five9.com/bundle/release-13-release-notes/raw/resource/enus/release-13-release-notes.pdf

Buyer action: Treat UC integration as a surface area that can change over time; contractually lock required behaviors and retest after significant releases.

- Release notes indicate ongoing changes that include UC adapters among other components; organizations should plan for change-control and revalidation after major releases. https://documentation-be.five9.com/bundle/release-13-release-notes/raw/resource/enus/release-13-release-notes.pdf Buyer action: Treat UC integration as a surface area that can change over time; contractually lock required behaviors and retest after significant releases.

02Why they buy

Differentiators supported by vendor documentation and ecosystem signals

Preconfigured UCaaS integration options are listed for Microsoft Teams, RingCentral, Zoom Phone, and Nextiva. https://www.five9.com/products/capabilities/ucaas-unified-communications
Bidirectional presence synchronization is documented or listed for some integrations, depending on the UC platform and configuration (for example, RingCentral). https://www.five9.com/products/capabilities/uc-integration/ringcentral
Administrative documentation for UC adapters exists, indicating repeatable deployment patterns and operational guidance. https://documentation-be.five9.com/bundle/uc-adapters-administrators-guide/raw/resource/enus/uc-adapters-administrators-guide.pdf

- Preconfigured UCaaS integration options are listed for Microsoft Teams, RingCentral, Zoom Phone, and Nextiva. https://www.five9.com/products/capabilities/ucaas-unified-communications - Bidirectional presence synchronization is documented or listed for some integrations, depending on the UC platform and configuration (for example, RingCentral). https://www.five9.com/products/capabilities/uc-integration/ringcentral - Administrative documentation for UC adapters exists, indicating repeatable deployment patterns and operational guidance. https://documentation-be.five9.com/bundle/uc-adapters-administrators-guide/raw/resource/enus/uc-adapters-administrators-guide.pdf

Where competitors may have differentiators

UC-native vendors may provide a single-suite procurement story that reduces integration overhead for organizations standardized on the same UC vendor.
Some CCaaS competitors emphasize workforce engagement management, AI capabilities, or reporting breadth; suitability depends on customer requirements and analyst perspectives.

03Field reports

Review platforms (broad Five9 product reviews; UC integration-specific mentions are intermittent)

G2 (Five9 overall):

Product reviews page: G2 product reviews
- Example review excerpt on G2 highlights CRM integration strengths but also mentions recurring technical issues in some reviews.

TrustRadius (Five9 overall):

Reviews index: TrustRadius product reviews

Gartner Peer Insights (partial access):

Snapshot page accessible, but full reviews may require login controls: Gartner Peer Insights snapshot

PeerSpot (Five9 overall):

Reviews index: PeerSpot product reviews

Many review platforms evaluate Five9 as a whole product, so review content can reflect a mix of product aspects, including core telephony quality, web agent UI stability, reporting, CRM integrations, and support/professional services. G2 (Five9 overall): - Product reviews page: G2 product reviews - Example review excerpt on G2 highlights CRM integration strengths but also mentions recurring technical issues in some reviews. TrustRadius (Five9 overall): - Reviews index: TrustRadius product reviews Gartner Peer Insights (partial access): - Snapshot page accessible, but full reviews may require login controls: Gartner Peer Insights snapshot PeerSpot (Five9 overall): - Reviews index: PeerSpot product reviews

Community/Social (Reddit) — direct user sentiment (operational reports)

Examples (user-submitted content):

“Anyone here using Five9?” — “We use five9 and it's garbage.” (Reddit discussion thread)
“Five9 Audio / Network issues” — complaint that the web platform is “buggy”. (Reddit discussion thread)
“Five9 is currently down.” (system-administration discussion) (Reddit discussion thread)
“Is anyone using Five9… connection is dogshit?” (Reddit discussion thread)

Community posts on Reddit frequently focus on operational issues, including outages, audio problems, and administrative challenges. Examples of user posts include general dissatisfaction and specific complaints about audio/network behavior. Examples (user-submitted content): - “Anyone here using Five9?” — “We use five9 and it's garbage.” (Reddit discussion thread) - “Five9 Audio / Network issues” — complaint that the web platform is “buggy”. (Reddit discussion thread) - “Five9 is currently down.” (system-administration discussion) (Reddit discussion thread) - “Is anyone using Five9… connection is dogshit?” (Reddit discussion thread)

UC integration-specific community feedback (Microsoft Teams presence behavior)

A Reddit post highlights a perceived gap where agents on a Five9 call still presented with Teams calls due to lack of bidirectional presence sharing in some configurations (user report; behavior may depend on version and configuration). (Reddit discussion thread)

Why customers select Five9 (patterns across sources)

Based on vendor case studies, review-platform excerpts, and community references, selection reasons that recur include:

A broad CCaaS feature set (routing, IVR, recording, workforce engagement management options)
Preconfigured integration options with UC and CRM systems
Enterprise-scale capabilities and an established vendor presence in the CCaaS market

Example vendor case study / testimonial (marketing source):

ProSites using Five9 integration with Microsoft Teams to view availability of experts and include them faster in calls. (Vendor press release / marketing case study)

Based on vendor case studies, review-platform excerpts, and community references, selection reasons that recur include: - A broad CCaaS feature set (routing, IVR, recording, workforce engagement management options) - Preconfigured integration options with UC and CRM systems - Enterprise-scale capabilities and an established vendor presence in the CCaaS market Example vendor case study / testimonial (marketing source): - ProSites using Five9 integration with Microsoft Teams to view availability of experts and include them faster in calls. (Vendor press release / marketing case study)

Why some customers discontinue or complain (patterns across sources)

From community posts and third-party critiques, complaints frequently center on:

Audio quality and network sensitivity
Web UI instability
Implementation and professional services scope issues
Reporting, workforce management, and workforce optimization fit (varies by customer requirements)

Note: These issues are not always specific to UC integrations, but they affect the overall experience of a Five9 deployment combined with a UC platform.

From community posts and third-party critiques, complaints frequently center on: - Audio quality and network sensitivity - Web UI instability - Implementation and professional services scope issues - Reporting, workforce management, and workforce optimization fit (varies by customer requirements) Note: These issues are not always specific to UC integrations, but they affect the overall experience of a Five9 deployment combined with a UC platform.

Case study / customer story: ProSites + Microsoft Teams UC integration

A Five9 press release describes ProSites migrating from on-premises infrastructure to Five9 and using the Teams integration to view availability of experts and bring them into calls more quickly. (Source: vendor press release)

Critical evaluation:

Described benefits (reduced delay, faster expert inclusion) are plausible, but quantitative metrics (AHT reduction, FCR, CSAT) are not provided in the accessible excerpt; ROI claims remain qualitative without additional data.

- A Five9 press release describes ProSites migrating from on-premises infrastructure to Five9 and using the Teams integration to view availability of experts and bring them into calls more quickly. (Source: vendor press release) Critical evaluation: - Described benefits (reduced delay, faster expert inclusion) are plausible, but quantitative metrics (AHT reduction, FCR, CSAT) are not provided in the accessible excerpt; ROI claims remain qualitative without additional data.

Case study / partner collateral: Five9 + Zoom Phone

A Zoom partner case study references Five9 UC Integration with Zoom. (Source: partner case study document)

Critical evaluation:

Partner-produced case studies are useful for illustrative purposes but are not independent validation. Buyers should request baseline call-quality metrics, cutover plans, and operational KPIs before and after deployment.

04Best fit

Company sizes

Most suitable for mid-market to enterprise contact centers (typically larger agent counts), particularly with distributed or hybrid workforces.

Industries

Environments where agent-to-expert collaboration is important:

Financial services
Healthcare administration
B2B services and appointments
Retail and customer support

Roles/personas

Decision makers: VP CX/Contact Center, IT/Telecom Director, CIO/CTO
End users: agents, supervisors, QA, workforce management, UC administrators

Pain points addressed

Fragmentation between contact center systems and internal collaboration tools
Delays in consulting or transferring to subject-matter experts
Multiple directories and inconsistent presence information

Qualification criteria (suitable fit)

Organizations that use Teams, RingCentral, or Zoom Phone and require consult/transfer/conference workflows integrated with a CCaaS solution.
Organizations prepared to invest in rollout work such as network readiness, headset certification, and administrative training.

05The pitch

What the product does (core value proposition)

Discover subject-matter experts (SMEs) in the corporate directory
View availability/presence (in some integrations, bidirectional)
Initiate consult/transfer/conference actions via click-to-contact workflows

Vendor materials describe the value proposition as preserving the existing UC platform (e.g., Microsoft Teams, RingCentral, Zoom Phone) while using Five9 for contact-center routing, reporting, and agent tooling. (Official UCaaS integrations overview page: Vendor product overview and feature pages)

Five9 UC Integrations (often positioned as UCaaS integrations or UC adapters) connect the Five9 Intelligent Cloud Contact Center (CCaaS) to enterprise Unified Communications (UC/UCaaS) systems so contact-center agents can more easily: - Discover subject-matter experts (SMEs) in the corporate directory - View availability/presence (in some integrations, bidirectional) - Initiate consult/transfer/conference actions via click-to-contact workflows Vendor materials describe the value proposition as preserving the existing UC platform (e.g., Microsoft Teams, RingCentral, Zoom Phone) while using Five9 for contact-center routing, reporting, and agent tooling. (Official UCaaS integrations overview page: Vendor product overview and feature pages)

Target market and positioning

Primary buyer: Contact center leadership (CX/Operations), IT/Telecom, and enterprise architecture teams who already run (or are standardizing on) Teams/RingCentral/Zoom Phone.
Positioning: Vendor communications cite Five9’s placement in analyst materials (e.g., Gartner MQ references in vendor materials). Five9 promotes UC integrations as a capability intended to reduce handle times, improve first-contact resolution, and support collaboration between front-line agents and back-office experts.

- **Primary buyer:** Contact center leadership (CX/Operations), IT/Telecom, and enterprise architecture teams who already run (or are standardizing on) Teams/RingCentral/Zoom Phone. - **Positioning:** Vendor communications cite Five9’s placement in analyst materials (e.g., Gartner MQ references in vendor materials). Five9 promotes UC integrations as a capability intended to reduce handle times, improve first-contact resolution, and support collaboration between front-line agents and back-office experts.

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