Sierra Becomes Primary Voice Channel

Voice becoming Sierra's main channel shows that the company is moving from being a better website chat widget to being a replacement for the biggest and most expensive part of customer support, the phone queue. Most support still starts on calls, not chat, so once Sierra can answer, authenticate, look up an order, process a refund, or update a subscription over voice, customer volume and contract value can rise much faster than text alone.

• Sierra's model is built for this shift. It sells multi year enterprise deployments, charges roughly $0.99 to $1.50 per successful resolution instead of per seat, and uses forward deployed teams to wire the agent into CRM, billing, and ERP systems so the bot can actually finish the job during a call.
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• The market context matters. About 80% of customer service interactions in the US still happen by phone, which is why voice is the largest expansion path for AI agents. In healthcare, companies like SuperDial and Infinitus already use voice agents to call insurers, navigate phone trees, and pull claim status, showing how much workflow lives off chat surfaces.
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• Compared with Intercom and Decagon, Sierra is positioned furthest toward full stack replacement. Intercom still pairs AI with a help desk and human agent workflow, while Sierra and Decagon push autonomous resolution. Sierra reached an estimated $100M ARR in October 2025 versus Decagon at $35M annualized revenue by October 2025, suggesting voice helped Sierra widen the gap by owning higher volume support traffic.
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From here, voice agents are likely to expand from inbound support into outbound sales, collections, claims follow up, and supplier calls. If Sierra keeps winning the phone channel, it will look less like support software and more like a new operating layer for customer facing work, with more conversation volume, more backend actions, and deeper control over enterprise workflows.