- •The contact center app and the carrier layer are separate things. Five9, RingCentral, and 8x8 sit on top of a carrier. They do not replace it.
- •Answer rates are a carrier-layer problem. SPAM LIKELY flags, dead air, and carrier suppression cannot be fixed inside the app.
- •Teams Plus is the carrier-grade infrastructure beneath Microsoft Teams contact centers. It works alongside Five9, RingCentral, 8x8, NICE, and TCN.
- •Early Media Detection across 200+ catalogued telecom announcements catches suppression events before they become call failures.
- •Flat-fee NRM means number reputation remediation is included, not billed per incident.
What's a good call center option for Microsoft Teams? Ask that question anywhere and you will get the same list every time: RingCentral, Five9, 8x8, NICE. It is a reasonable list. We deploy and integrate these platforms ourselves, and Five9 named us its 2025 Canada Partner of the Year in the Five9 Global Partner Awards.
But the list answers the wrong question. The contact center app you choose determines your interface, your workflows, and your reporting screens. It does not determine whether your calls connect. That outcome lives one layer down, at the carrier, and it is the layer almost nobody evaluates.
What a Teams Contact Center Actually Needs
Strip a contact center down to its components and you get two distinct layers.
The application layer handles the interface: agent desktops, queues, IVR design, workforce management, CRM integration. Five9, RingCentral, 8x8, NICE, and TCN compete here, and they compete well.
The carrier layer handles delivery: phone numbers, PSTN connectivity, outbound answer rates, spam suppression, call quality, recording capture, and provisioning at scale. Every application above depends on it, and no application can fix it.
| App Layer (CCaaS) | Carrier Layer (Teams Plus) | |
|---|---|---|
| Agent desktop and workflows | Yes | No |
| IVR and queue design | Yes | No |
| PSTN connectivity and call delivery | No | Yes |
| Answer Seizure Ratio commitment | Not applicable | 85%+ for high-volume outbound |
| SPAM LIKELY flag detection | Not visible | Monitored continuously |
| Early Media Detection | Not visible | 200+ catalogued announcements |
| Number Reputation Management | Cannot remediate | Flat-fee, included |
| Network uptime SLA | Depends on carrier | 99.999% |
The Answer Rate Problem
Here is the pattern we see constantly. A contact center launches on Teams with a strong CCaaS platform. Performance looks fine at first. Then answer rates decay month over month, and the team blames the dialer, the scripts, the list. The actual cause is usually carrier-layer number reputation.
When carrier analytics engines flag your numbers as SPAM LIKELY, consumers stop answering and some calls are suppressed outright. No setting inside Five9 or RingCentral can fix a carrier-level flag, because the flag is applied before the call ever reaches the platform.
Worse, the platform's own reporting can hide the damage. A dialer can receive a 200 OK, the SIP response that says the call connected at the network layer, while the call was labeled or blocked before it ever reached a human. The system thinks it worked. It did not. That gap between what the dialer reports and what actually happened is where silent revenue loss lives.
The same applies to suppression events that produce dead air or early terminations. Catching them requires Early Media Detection at the carrier layer. We maintain Early Media Detection across 200+ catalogued telecom announcements for exactly this reason: each announcement tells you something different about why a call failed, and the app layer never sees any of it. We covered the recovery side of this in Carrier Trust Score Recovery.
What Teams Plus Brings to a Teams Contact Center
We are not a competitor to the platforms above. We are the carrier layer beneath Microsoft Teams contact center platforms. Teams Plus works alongside Five9, RingCentral, and 8x8, as well as NICE, TCN, and any SIP-compatible platform, without rearchitecting anything. See the full platform
What that layer includes: 99.999% network uptime on geo-redundant infrastructure. An 85%+ Answer Seizure Ratio for high-volume outbound operations, against an industry average closer to 50 to 60 percent. Flat-fee Number Reputation Management, so spam flag remediation is included rather than billed per incident. And Early Media Detection that surfaces suppression events before they become weeks of silent call failures. Explore Collections
Operator Connect or Direct Routing for Contact Centers
Both connection models bring carrier service into Teams. Operator Connect is the fastest path in and is managed through the Teams admin center. Direct Routing keeps routing control at the carrier layer, which matters for high-volume outbound operations and for any organization that may run multiple voice applications over time. For most contact centers, Direct Routing is the better fit. The full comparison is here: Operator Connect vs Direct Routing.
What to Ask Before Choosing a Contact Center Platform
Evaluate the app on its merits. Then ask the four questions that decide the outcome:
- Who manages your carrier layer, and is that a named accountability or an afterthought?
- What Answer Seizure Ratio will they commit to in writing?
- How is number reputation monitored and remediated, and is it flat-fee or billed per incident?
- Is Early Media Detection included, or are failed calls just a mystery?
If a vendor cannot answer those four questions, the platform demo does not matter.
So the answer to the original question is genuinely two answers. Pick the contact center application that fits your workflows: Five9, RingCentral, 8x8, NICE, and TCN are all credible choices, and we work with all of them. Then make a deliberate decision about the carrier layer underneath it, because that decision, not the app logo on the agent's screen, is what your answer rates will reflect a year from now.
