Dialpad Multi-Line Dialing: Setup, Tips, and Limits

Written by: Matt Beucler, CEO, Plura AI

Key Takeaways

• Dialpad multi-line dialing covers simultaneous ring for inbound calls, three-way calling for merging participants, and the Dialpad Dialer for progressive outbound campaigns with configurable lines-per-agent settings.⁴
• Simultaneous ring can be configured at the department level or through a Simultaneous Ring Contact Center, though the latter is limited to 25 users and currently in Early Adopter Program.
• Three-way calls work across desktop, web, and mobile apps, with merge options available when you receive inbound calls during active conversations.
• The Dialpad Dialer automates outbound campaigns for teams with Sell Premium licenses, but it does not include predictive dialing or autonomous AI agents for very high outbound volume.
• When Dialpad’s capabilities reach their limits for large-scale outbound, Plura AI provides AI-powered multi-line dialing with autonomous agents across multiple channels.

How Dialpad Handles Multi-Line Dialing

Dialpad multi-line dialing spans two distinct use cases. On the inbound side, it includes simultaneous ring, which routes one incoming call to multiple devices or agents at once, and three-way calling, which merges multiple live participants into a single call. On the outbound side, it includes the Dialpad Dialer, a progressive outbound dialer that automatically works through a contact list and connects only answered calls to available agents. A configurable lines-per-agent setting controls campaign pacing.

Dialpad’s own documentation covers these capabilities across separate help pages, with no single source addressing all aspects of multi-line dialing. Dialpad’s Dialer overview and streamlined call controls documentation each cover one piece of the picture. This guide consolidates those details in one place.

Setting Up Simultaneous Ring in Dialpad

Simultaneous ring makes an inbound call ring multiple devices or coworkers at once so your team can pick up faster. Dialpad supports two paths for configuring it: department-level simultaneous ring and a dedicated Simultaneous Ring Contact Center.

Department-Level Simultaneous Ring (per ServiceTitan’s Dialpad integration documentation):

1. Navigate to Settings and select Departments.
2. Select the target department and scroll to Business Hours & Call Routing.
3. Click Edit Call Routing.
4. Locate the routing options for operators and check the Simultaneous Ring option.
5. Confirm the “Changes Saved” banner appears.

Simultaneous Ring Contact Center (per Dialpad’s help documentation):

1. Go to Admin Settings and select Contact Centers.
2. Select the + icon (or “Create Contact Center” for Office Admins).
3. Choose Voice, then select “Ring all agents at once.”
4. Name the contact center, add an optional description, and click Create.
5. Assign a phone number by selecting “Add a number” on the Contact Center page.
6. Add agents by navigating to Agents and Admins and entering agent names in the search bar.

Simultaneous Ring Contact Centers currently sit in an Early Adopter Program (EAP), are capped at 25 total users, do not support auto answer, and do not support simultaneous ringing for callbacks. Callbacks ring one agent at a time. In addition, simultaneous ring is only available for departments, not for AI call centers.

Making a Three-Way Call in Dialpad

Desktop or Web App (per Dialpad’s call transfer documentation):

1. During an active call, place the current call on hold.
2. Select the Call icon and dial the second person’s name or number.
3. Once connected, open Options (the three vertical dots) on the held call.
4. Select Merge to join both calls.

iPhone App (per Dialpad’s iOS app documentation):

1. During an active call, tap Add.
2. Choose a contact from the list or enter their name or number.
3. Repeat to add up to three callers total to the active call.

Android app steps follow the same merge pattern as the desktop app. Three-way conference calling is also confirmed on specific desk phones, including Poly VVX OBi Edition models (VVX 250, VVX 350, VVX 450) and Yealink T-series and room phone models.

Managing Multiple Calls and Participants in Dialpad

Dialpad’s Streamlined Call Controls, released May 13, 2025, introduced a floating call bar that keeps essential controls accessible during active calls on the Native Desktop App, browser app, Progressive Web App, and Dialpad Chrome CTI extension. This call bar is where you manage participants during a multi-party call.

To manage participants during a multi-party call:

1. Select “Manage participants” from the call bar.
2. Use the pop-up to mute speakers, view live transcripts, turn on recording, or remove someone from the call.

When an inbound call arrives during an active call, Dialpad displays two options. Selecting ANSWER places the current call on hold. Selecting MERGE immediately joins both calls into a single conversation.

Dialing Multiple Numbers at Once in Dialpad

Dialpad does not support manually dialing multiple numbers simultaneously from the keypad. Multi-line dialing in Dialpad relies on two separate mechanisms that depend on call direction.

For inbound calls, simultaneous ring routes a single incoming call to multiple devices or agents at once, as described in the setup steps above. For outbound calls, the Dialpad Dialer automatically works through a contact list and connects only answered calls to available agents. The lines-per-agent setting controls how many lines dial simultaneously per agent during a campaign. Dialpad does not provide a manual keypad method for dialing multiple numbers at once.

Book a live demo with Plura AI to see how AI-powered multi-line dialing handles outbound volume that exceeds what Dialpad’s Dialer is built for.

Configuring Dialpad Dialer for Outbound Campaigns

The Dialpad Dialer is a progressive outbound dialer built into Dialpad that automates high-volume outreach for prospecting, fundraising, and recruiting. It is available to organizations with Dialpad Sell Premium licenses and to users assigned to a Contact Center where Dialer is enabled.

To create and configure a campaign (per Dialpad’s campaign creation documentation):

1. Navigate to dialer.dialpad.com.
2. Create a new campaign and select the target Contact Center.
3. Configure Lines per agent using the plus and minus icons to set campaign pacing.
4. Set calling windows and time zones to control when contact attempts occur.
5. Configure attempt limits, from 1 to 15 attempts per lead, subject to company-wide limits, and set the delay between attempts.
6. Enable Do Not Contact (DNC) scrubbing, which is on by default.¹
7. Schedule the campaign to launch immediately or up to 7 days in advance.

Dialpad’s troubleshooting documentation notes that very low lines-per-agent values, such as 1 line per agent, may slow throughput. Because Dialpad does not publish a universal best-practice number for this setting, the optimal value depends on list quality, calling windows, and agent availability.

Dialpad Multi-Line Dialing on iPhone and Android

iPhone: HD Calling uses internet or mobile data for inbound and outbound calls. Enable it under Calling Preferences > Call Experience in the iOS app. To merge calls, tap Add during an active call and select a contact. If the device is not ringing with HD Calling enabled, ServiceTitan’s mobile troubleshooting guide recommends confirming HD Calling is enabled for inbound calls, the app is running in the background, and notifications are on for both the app and the device. As a secondary step, navigate to Settings > Accessibility > Touch > Call Audio Routing and select Speaker.

Android: The merge pattern follows the same steps as the desktop app. One behavioral difference matters for call handling. On iOS, an incoming carrier call puts the Dialpad HD call on hold automatically. On Android, the HD call is only put on hold if the user actively answers the carrier call. Ignoring the carrier call leaves the HD call uninterrupted.

On both platforms, Dialpad mobile apps do not support VPN connections, which can cause calling issues. Avoid VPN when using Dialpad on mobile.

Troubleshooting Dialpad Multi-Line Dialing

Calls not ringing: ServiceTitan’s Phones Pro troubleshooting guide identifies incorrect business hours setup, incorrect routing setup, and no agents set to Available as the most common causes. Verify operators are assigned under Assigned Operators and Phones on the Main Line screen. If routing points to a department or call center, check that department’s business hours and routing settings as well.

Calls not answerable despite showing as available: ServiceTitan’s documentation identifies multiple ring-to devices of the same type, such as multiple browsers, as the cause. Navigate to Profile > Your Devices in Dialpad and uncheck the Ring to checkbox next to all but the current device.

Simultaneous ring not working: Confirm you are editing the correct department and that the Changes Saved banner appears after enabling the option. Remember that simultaneous ring is only available for departments, not AI call centers.

Dialer campaigns idle: Dialpad’s Dialer troubleshooting documentation lists the most common causes. These include lines-per-agent set too low, insufficient eligible leads in the list, leads falling outside calling windows, and too few agents set to Available. Verify all four before escalating to Dialpad Support.

Voicemail detection issues: If AMD (Answering Machine Detection) is flagging live answers or missing voicemails, review whether AMD is enabled in campaign settings. Dialpad’s troubleshooting guide recommends considering turning AMD off to route all answers directly to agents.

When Dialpad’s Multi-Line Dialing Reaches Its Limits

Dialpad’s Dialer works for teams with Sell Premium licenses running moderate outbound volume. It is a UCaaS platform built to enhance human reps with AI features like transcription, call summaries, and CSAT prediction. Dialpad’s AI features assist human agents and do not deploy autonomous AI agents.

High-volume outbound teams often hit real limits with that model. As one Director of Sales at a National Home Services Company put it: “We tried to make Dialpad handle our outbound lead generation campaigns. Great product for what it does, but it is not built for deploying autonomous AI agents at scale. Plura AI was purpose built for exactly that use case.”

Plura AI’s AI Predictive Dialer is built for that use case. Where Dialpad enhances human agents with AI transcription and summaries, Plura deploys fully autonomous AI agents across voice, SMS, RCS, and webchat simultaneously, enriching contacts with intelligence from 30+ data sources before conversations begin.

Key differentiators for high-volume outbound teams:

• FCC-licensed carrier with branded caller ID and STIR/SHAKEN authentication on every call^1,2
• Real-time DNC scrubbing and TCPA compliance support enforced before every dial^1,2
• Stateful conversation memory across voice, SMS, RCS, and webchat so context carries across every channel
• 100% U.S. infrastructure with no offshore exposure
• Under 5 seconds to first contact, 3x average ROI in 90 days, 47% pipeline growth, 90% faster lead-response time³

Compare plans and rates side by side on our pricing page.

Frequently Asked Questions

Can You Have Multiple Lines on Dialpad?

Dialpad supports multiple lines through main lines, department numbers, and contact centers. Simultaneous ring lets you route one incoming call to multiple devices or agents at once. The Dialpad Dialer supports N:1 lines-per-agent configuration for outbound campaigns, meaning multiple lines can dial simultaneously per available agent. The Simultaneous Ring Contact Center feature, currently in Early Adopter Program, extends this to a dedicated contact center routing type capped at 25 users.

How Do I Merge Calls in Dialpad?

On the desktop or web app, place the active call on hold, dial the second person, then open Options, the three vertical dots, on the held call and select Merge. On the iPhone app, tap Add during an active call and select a contact. Up to three callers can be added. When receiving an inbound call during an active call on any platform, select MERGE to join both calls immediately, or ANSWER to place the current call on hold first.

Is Dialpad Dialer a Predictive Dialer?

Dialpad Dialer is a progressive outbound dialer. It automatically dials through a contact list and connects only answered calls to available agents. It does not use predictive algorithms to over-dial across an agent team the way a true predictive dialer does. For AI-powered predictive dialing at scale, Plura’s AI Predictive Dialer is purpose-built for high-volume outbound teams that need autonomous AI agents working across multiple channels simultaneously.

What Is the Maximum Number of Lines per Agent in Dialpad Dialer?

Dialpad does not publish a universal maximum or recommended number for the lines-per-agent setting. The setting controls campaign pacing, and Dialpad’s troubleshooting documentation warns that very low values, such as 1 line per agent, may slow throughput. The optimal setting depends on list quality, calling windows, and agent availability. Administrators adjust the value using the plus and minus icons in the campaign editor at dialer.dialpad.com.

Does Dialpad Support Autonomous AI Agents for Outbound Campaigns?

As noted earlier, Dialpad’s AI features augment human agents rather than deploying autonomous agents. Dialpad provides automatic transcription, generated call summaries, CSAT prediction, and an AI Phone Agent for inbound handling and outbound follow-up reminders. These features support human reps instead of running fully autonomous agents that can qualify leads, handle objections, and manage multi-channel conversations without human involvement. Teams that need autonomous AI agents at outbound scale typically look beyond Dialpad’s native capabilities.

Conclusion: Use Dialpad Effectively and Plan Your Next Step

This guide consolidated the core details about Dialpad multi-line dialing. You now have simultaneous ring setup at the department and contact center level, three-way calling on desktop and mobile, participant management with Streamlined Call Controls, Dialer campaign configuration, device-specific instructions for iPhone and Android, and troubleshooting for the most common issues.

Dialpad handles everyday multi-line call management well for teams with the right license tier. When outbound volume grows beyond what a progressive dialer and human agents can absorb, the platform’s architecture reaches its limits. Plura’s AI Predictive Dialer delivers true multi-line dialing at scale, with autonomous AI agents, stateful cross-channel memory, and carrier-grade compliance support built into the platform.

Book a live demo with Plura AI to see how AI-powered multi-line dialing can reshape your outbound campaigns.

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