Collect Video Testimonials That Build TrustBest AI Voice Agents
By Venkatraman C
Last updated on Sep 28, 2026AI Voice Agents are AI powered systems that can conduct real time spoken conversations and carry out business tasks during or after a call.
### Agent Workflows and Actions Bland goes beyond generating spoken responses by allowing voice agents to operate through Conversational Pathways. These workflows can use branching logic, knowledge base lookups and real time API calls. Agents can collect information, authenticate callers, qualify prospects, update connected systems and determine the next step in a conversation based on the configured workflow. ### Integrations and Triggers Bland connects with CRM, telephony, scheduling, contact center and automation systems. HubSpot workflows can trigger calls from tickets, tasks and deals, while Zapier can receive post-call webhooks containing transcripts, outcomes and contact data. Custom API connections support HTTP methods, authentication, dynamic request bodies, response parsing and variable mapping. ### Deployment, Handoff and Monitoring Bland supports configurable escalation paths when an agent cannot complete a request, including warm transfers, department routing, messages and scheduled callbacks. Agents can be tested against scenarios before production and monitored during live calls. Enterprise deployments can also use dedicated infrastructure and on premises or VPC deployment options.
### Tool Execution Vapi gives voice agents multiple ways to perform actions. Built in tools support call transfers, SMS, keypad input and API requests. Function tools send requests to developer controlled servers, while the Query tool searches knowledge bases. MCP extends this model by allowing assistants to discover and execute external tools dynamically during a conversation. ### Multi Assistant Orchestration Vapi Squads divide complex conversations among specialized assistants. Handoff tools define which assistant should receive the conversation and under what conditions. Context, extracted variables and summaries can be passed between assistants, allowing a caller to move between specialized tasks without starting a separate interaction. ### Testing and Operations Vapi provides simulations, evaluations, monitoring and logs for production voice agents. Logs cover calls, chats, sessions, webhooks and API requests. The platform also exposes APIs, SDKs and webhooks, giving development teams programmatic control over assistant configuration and operations.
### Workflow Execution Retell combines voice conversations with workflow execution before, during and after calls. Pre-call functions can retrieve customer data and pass it into the conversation as dynamic variables. Post-call functions can update connected systems or initiate follow-up actions. Functions can run sequentially or in parallel, allowing teams to model dependencies around a phone interaction. ### Agent Operations and Integrations Agents can use CRM data, knowledge bases, calendars, telephony systems and custom functions during calls. Retell also supports human handoff, live monitoring and call takeover. Its visual call flow environment combines integrations, transfers, DTMF, SMS and custom logic for more complex phone based processes. ### Developer Control Retell provides APIs, SDKs, webhooks and a hosted MCP server. MCP compatible clients can create and update agents, launch calls, manage phone numbers and knowledge bases, inspect recent calls and run QA operations. This provides both visual configuration and programmatic control for teams managing production voice agents.
