Call whisper software gives the person answering an inbound call private context before the caller connects.
Suppose the same inbound sales team answers phone leads from Google Ads, organic search, referral campaigns, and several locations. A pre-call whisper can tell the representative which source, campaign, keyword, or location generated the call before the conversation begins.
This article compares 10 call whisper software options for CRM-connected marketing and sales teams. The comparison focuses on pre-call context, the CRM connection method, attribution, setup requirements, pricing, and buyer fit. The vendors are grouped by product type and fit rather than ranked from first to tenth.
Quick comparison of the best call whisper software options
| Vendor | Product type | Whisper context | CRM path | Pricing | Setup | Best for |
| AvidTrak | Call tracking and attribution | Campaign, keyword, source, or marketing-channel context | Direct Salesforce, HubSpot, and Zoho connections | Starter: $15/month with 5 numbers and 500 minutes | Business-user setup | Marketing and inbound sales teams that want pre-call context tied to attribution and CRM records |
| CallRail | Lead and call tracking | Source, campaign, keyword, and tag context | Direct integrations including HubSpot and Salesforce | Lead Tracking: $50/month plus usage, with 5 numbers and 250 minutes | Business-user setup | Teams that want packaged call tracking with established CRM connections |
| CallScaler | Call tracking | Source, campaign, keyword, custom audio, and press-to-accept | Zapier and webhooks | Pro: $65/month or $45/month billed annually, plus usage | Low to moderate | Lead-generation and pay-per-call teams that want dynamic whisper context |
| CallTrackingMetrics | Call tracking and conversation analytics | Account whisper or source announcement | Native integrations including HubSpot and Salesforce | Marketing Pro: $179/month or $149/month with annual prepayment, plus usage | Moderate | Teams that need deeper routing, CRM, attribution, and call-management controls |
| Dialics | Inbound call tracking | Campaign-specific whisper | Webhooks and custom connections | Base subscription plus usage; U.S. local numbers are $1/month and local calls are $0.045/minute | Moderate | Pay-per-call and performance-marketing teams that can support a custom CRM path |
| Nimbata | Call tracking and conversation intelligence | Source, campaign, and attribution context | HubSpot, Zoho, Pipedrive, Salesforce, API, and webhooks depending on plan | Marketing: $89/month or $80/month with annual billing, plus usage | Business-user setup | Marketing teams and agencies that want whisper messages with packaged CRM options |
| WhatConverts | Lead tracking and attribution | Private whisper messages with marketing-source context | CRM workflows through Zapier | Call Tracking: $30/month with a $30 usage credit | Low to moderate | Teams that track calls alongside forms, chat, and other lead types |
| Invoca | Enterprise conversation intelligence and revenue execution | Call whisper with enterprise routing and digital-context capabilities | Enterprise integrations including Salesforce | Quote-based | Higher-complexity enterprise setup | Larger organizations that need routing, attribution, pre-call context, and conversation data |
| Twilio | Programmable communications | Custom source, purpose, caller, IVR, or CRM-derived context | Developer-built CRM connection | U.S. local inbound calls: $0.0085/minute; local number: $1.15/month | Developer required | Technical teams that want custom whisper and CRM logic |
| Vonage | Programmable communications | Custom campaign, dialed-number, or caller context | Developer-built data and CRM logic | U.S. incoming domestic calls start at $0.00485/minute | Developer required | Technical teams building a custom inbound voice workflow |
Pricing and plan information was checked in September 2026.
What is call whisper software?
Call whisper software plays a private audio message to the person receiving an inbound call before the caller joins the conversation. Depending on the platform, the message may identify the marketing source, campaign, keyword, location, tracking number, caller purpose, or another piece of known context.
AvidTrak, for example, documents a private message played to the receiving party before connection and gives a marketing channel as a typical use case. AvidTrak supports text-based whisper messages and uploaded MP3 audio.
The feature becomes more useful when call tracking and whisper work together because the tracking system identifies why the call was generated while the whisper passes selected context to the person answering.
Pre-call whisper vs. live supervisor whisper
A pre-call whisper happens before the representative and caller begin speaking. The representative hears private information about the inbound call while the caller waits to be connected.
A supervisor whisper happens during an active customer conversation. A supervisor privately speaks to the agent without the customer hearing the coaching.
The distinction matters because software companies use the same term for different functions. Twilio documents call whisper as pre-connect information for the receiving party, while AvidTrak separately documents live supervisor whisper as a coaching feature during an active call.
Teams that primarily need live listening, private coaching, and barge-in functions should compare call monitoring software rather than the pre-call products covered here.
How the call whisper software options were compared
A useful call whisper comparison needs to look beyond whether a product lists a feature called “whisper.”
The 10 options were evaluated using the same core criteria:
- Whisper timing: The information should reach the receiving person before the caller joins the conversation.
- Context available: The platform may announce a source, campaign, keyword, location, tracking number, caller detail, or another useful field.
- CRM connection: A direct integration differs from a Zapier workflow, a webhook, or a developer-built API connection.
- Attribution: Marketing teams need to know whether the call can be tied to the campaign or source that generated it.
- Post-call data: CRM-connected teams may also need recordings, call details, transcripts, outcomes, or lead data after the conversation.
- Setup requirements: Packaged call tracking software requires a different level of technical work from a programmable voice API.
- Pricing model: Subscription, usage-based, and quote-based products should not be treated as equivalent.
- Buyer fit: A marketing team, a pay-per-call operation, an enterprise organization, and a development team have different requirements.
AvidTrak is evaluated under the same criteria as every other vendor.
10 call whisper software options for CRM-connected teams
The first seven options are packaged call tracking or lead-attribution platforms. Invoca serves a more enterprise-focused use case, while Twilio and Vonage are programmable options for teams with development resources.
AvidTrak
Best for: Marketing and inbound sales teams that want source context before a call and call data connected with a CRM.
Product type: AvidTrak is a call tracking and marketing attribution platform.
Whisper capability: AvidTrak plays a private message to the receiving party before the caller connects. AvidTrak documents marketing-channel announcements as a typical use case and also supports campaign, keyword, and source context in PPC call-tracking workflows.
CRM connection: AvidTrak connects call tracking with Salesforce, HubSpot, and Zoho. Its CRM call tracking workflow can connect inbound calls and attribution data with CRM records.
Pricing model: The Starter plan costs $15 per month and includes five numbers and 500 minutes. AvidTrak also offers a 14-day trial without requiring a credit card.
Why AvidTrak may fit: AvidTrak combines pre-call source context with Dynamic Number Insertion, marketing attribution, routing, recording, transcription, and CRM connections. The combination can give a marketing or sales team context before the call and maintain attribution information afterward.
CallRail
Best for: Marketing and inbound sales teams that want packaged call tracking with established CRM integrations.
Product type: CallRail is a lead and call tracking platform.
Whisper capability: CallRail plays a private message to the person answering before the caller is connected. Dynamic keyphrases can insert source, campaign, keyword, and tag information into the message.
CRM connection: CallRail provides direct HubSpot and Salesforce integrations. Its HubSpot integration can connect call activity and marketing attribution with CRM records.
Pricing model: Lead Tracking costs $50 per month plus usage and includes five local numbers and 250 local minutes. A 14-day trial is available.
Why CallRail may fit: CallRail provides attribution, recording, routing, whisper messages, and CRM connections through a packaged business-user interface.
Important limitation: CallRail states that whisper messages cannot be used when calls route to a team or a Queue step. Automated answering systems, greetings, and hunt groups can also interfere with whisper playback.
CallScaler
Best for: Lead-generation, agency, and pay-per-call teams that need dynamic source context before answering.
Product type: CallScaler is a call tracking platform built around marketing and lead-routing workflows.
Whisper capability: CallScaler includes call whisper on every plan. Messages can use text-to-speech or uploaded audio and can insert source, campaign, and keyword information. An optional press-to-accept step can require the representative to confirm the call before connection.
CRM connection: CallScaler provides Zapier and real-time webhooks for sending call and lead data into other business systems.
Pricing model: Pro costs $65 per month on monthly billing or $45 per month when billed annually, plus usage. Local numbers cost $0.50 per month and local minutes cost $0.045.
Why CallScaler may fit: Dynamic whisper fields and flexible automation can suit teams handling calls from several campaigns or lead buyers.
Important limitation: CallScaler relies more heavily on automation and webhooks for CRM workflows than platforms that provide direct named CRM connectors.
CallTrackingMetrics
Best for: Teams that need call attribution, CRM connectivity, advanced routing, and more involved call-management controls.
Product type: CallTrackingMetrics is a call tracking and conversation analytics platform.
Whisper capability: CallTrackingMetrics supports two types of receiving-party whisper. Its documentation identifies an account whisper and a source-announcement whisper, with availability beginning on Marketing Pro among current listed plans.
CRM connection: CallTrackingMetrics provides native integrations including HubSpot and Salesforce.
Pricing model: Marketing Pro costs $179 per month with monthly billing or $149 per month with annual prepayment.
Why CallTrackingMetrics may fit: The platform can support attribution, routing, CRM activity, conversation data, and phone operations inside one system.
Important limitation: The broader feature set comes with more setup complexity and a higher relevant plan price than simpler call tracking platforms.
Dialics
Best for: Pay-per-call and performance-marketing teams that need campaign-specific whisper messages and can support a custom CRM data path.
Product type: Dialics is an inbound call tracking platform with campaign attribution and routing tools.
Whisper capability: Dialics supports campaign-specific whisper messages that play to the receiving person before the caller is connected.
CRM connection: Dialics supports outgoing webhooks that can send call-event data to external applications. The public integration documentation reviewed for this article does not establish a direct HubSpot or Salesforce connector, so a CRM-connected team should plan for a webhook or another custom connection unless Dialics confirms another route.
Pricing model: Dialics lists U.S. local numbers at $1 per month and local calls at $0.045 per minute. Dialics’ terms state that a separate monthly subscription fee also applies, but the public pricing table does not state the amount. A seven-day trial includes a $10 test balance.
Why Dialics may fit: Campaign-level whisper messages, attribution, and pay-per-call functions can suit performance-marketing operations that already have technical resources for external data connections.
Important limitation: A complete all-in monthly cost cannot be calculated from public information because the base subscription amount is not shown. Dialics is therefore not used in any price-ranking claim in this article.
Nimbata
Best for: Marketing teams and agencies that want source-aware whispers, attribution, and packaged CRM options.
Product type: Nimbata is a call tracking and conversation intelligence platform.
Whisper capability: Nimbata lists call whispers from the Pro plan upward.
CRM connection: HubSpot, Zoho CRM, and Pipedrive appear on the Marketing plan. Salesforce, API access, and webhooks appear on the Agency plan.
Pricing model: Pro costs $39 per month, or $35 per month with annual billing. For packaged CRM integrations, Marketing costs $89 per month, or $80 per month with annual billing. Agency costs $149 per month, or $120 per month with annual billing. Nimbata describes its standard usage model as per answered call rather than per minute.
Why Nimbata may fit: The plan structure gives buyers a clear path from whisper and attribution functions into CRM-connected workflows.
Important limitation: The lower Pro price does not include the packaged CRM integrations central to this comparison, so CRM-connected teams should evaluate Marketing or Agency rather than comparing only the Pro price.
WhatConverts
Best for: Marketing teams and agencies that want call whisper alongside attribution for calls, forms, chat, and other lead types.
Product type: WhatConverts is a lead tracking and marketing attribution platform.
Whisper capability: WhatConverts plays an automated message to the receiving party before connection and describes the feature as a way to tell the recipient how the lead was generated.
CRM connection: WhatConverts’ HubSpot workflow operates through Zapier and requires separate automated workflows for different data directions.
Pricing model: The Call Tracking plan costs $30 per month and includes a $30 usage credit. A 14-day free trial is available.
Why WhatConverts may fit: The product can suit teams that want one attribution system for phone calls and other lead types rather than treating calls separately.
Important limitation: The HubSpot connection requires Zapier configuration rather than a direct account-to-account integration. WhatConverts also notes that the connection depends on separately configured workflows.
Invoca
Best for: Larger organizations that need enterprise routing, attribution, conversation data, and call whisper.
Product type: Invoca is an enterprise conversation intelligence and revenue execution platform.
Whisper capability: Invoca lists advanced IVR features and call whisper within its Performance Enterprise package.
CRM connection: Invoca lists Salesforce among its premium integrations and supports APIs and webhooks across relevant enterprise workflows.
Pricing model: Invoca uses a quote-based buying process rather than publishing a standard monthly subscription amount for these packages.
Why Invoca may fit: Invoca is suited to larger organizations that need routing, attribution, CRM data, and conversation analysis across a more involved call operation.
Important limitation: The platform serves a more complex enterprise use case than a marketing team that only needs several tracking numbers and a simple source announcement.
Twilio
Best for: Development teams that want full control over a custom whisper and CRM workflow.
Product type: Twilio is a programmable communications platform rather than a packaged marketing call tracking application.
Whisper capability: Twilio can play information to the receiving party while the caller continues to hear ringing. The workflow can use source, purpose, caller, IVR, or CRM-derived information and can also allow the receiving person to accept or reject the call.
CRM connection: The CRM lookup and data flow depend on the application a development team builds.
Pricing model: In the United States, a local number costs $1.15 per month and incoming local calls cost $0.0085 per minute. Outbound calls to the United States and Canada cost $0.014 per minute.
Why Twilio may fit: A development team can control the whisper message, caller lookup, acceptance logic, routing, and CRM interaction.
Important limitation: Twilio is not a ready-made marketing call tracking dashboard. Development resources are needed to build and maintain the call flow, CRM connection, reporting, and attribution logic.
Vonage
Best for: Technical teams that want to build a programmable pre-call whisper into a custom inbound voice application.
Product type: Vonage Voice API is a programmable communications product.
Whisper capability: Vonage documents an inbound workflow in which the call-center representative hears private context before being connected to the caller. The example uses the number dialed to determine which advertising campaign the call concerns.
CRM connection: CRM information can be retrieved through custom application logic. Vonage also sells a separate Contact Center product, so those Contact Center integrations should not be assumed to apply automatically to a Voice API implementation.
Pricing model: Vonage Voice API uses pay-per-use billing. Published U.S. pricing starts at $0.00485 per minute for incoming domestic PSTN calls and $0.00849 per minute for outbound domestic calls.
Why Vonage may fit: The Voice API gives a technical team control over campaign-aware whisper messages, data lookups, routing, and the surrounding call application.
Important limitation: The pre-call whisper requires development work, and buyers need to keep Voice API functions separate from the features sold through Vonage Contact Center.
How to choose call whisper software for a CRM-connected team
For a CRM-connected marketing or sales team, the right choice depends on the complete phone-lead workflow, not the presence of a whisper feature alone.
Compare direct CRM integrations with automation, webhooks, and APIs
CRM connectivity can take several forms.
A direct connection can move call and attribution information into a CRM with relatively little custom work. AvidTrak connects with Salesforce, HubSpot, and Zoho, while CallRail provides direct HubSpot and Salesforce integrations.
A Zapier-based connection adds an automation layer. WhatConverts, for example, uses Zapier workflows to move leads into HubSpot and return deal information to WhatConverts.
Webhooks send structured call events to another application. CallScaler and Dialics both support this model.
An API gives a technical team more control but requires development work. Twilio and Vonage fall into this category for the pre-call workflows compared here.
The useful question is not simply whether a platform connects with a CRM. A buyer should ask how the connection works and who will maintain it.
Decide what the whisper needs to announce
A static message may only need to say “Google Ads call” or “New sales inquiry.”
A dynamic whisper can provide more specific context when the platform already has the relevant tracking data. Depending on the product, the receiving person may hear the marketing source, campaign, keyword, location, tracking number, caller detail, product interest, or CRM-derived information in a custom application.
Keyword and campaign context becomes particularly useful when PPC call tracking connects a phone lead with the search or campaign activity that produced it.
Check what happens after the call
Pre-call context only covers the beginning of the phone conversation.
A CRM-connected marketing or sales team should also decide which information needs to remain available afterward. Relevant records may include the call record, marketing source, campaign or keyword, recording, transcript, status, outcome, conversation summary, or a link to the original call.
The right data depends on the team. A marketing team may prioritize source and campaign attribution, while a sales team may place more value on recordings, follow-up information, and CRM activity.
Match the product to the team’s technical resources
Packaged products such as AvidTrak, CallRail, Nimbata, WhatConverts, CallScaler, Dialics, and CallTrackingMetrics provide user interfaces for tracking numbers, call flows, attribution, and reporting.
Twilio and Vonage Voice API follow a different model. Both allow a technical team to create specific whisper and data workflows, but developers must build and maintain the application logic.
A marketing team without development support will normally need a different deployment model from a software team that wants programmatic control.
Compare the plan that supports the required workflow
The lowest advertised price is not always the price of a CRM-connected whisper setup.
Nimbata includes call whispers from Pro, but HubSpot, Zoho CRM, and Pipedrive appear on the higher Marketing plan. Salesforce, API access, and webhooks appear on Agency.
CallTrackingMetrics makes receiving-party whispers available from Marketing Pro rather than Marketing Lite.
Before choosing a platform, compare the plan containing call whisper, the plan containing the required CRM connection, included usage, additional number or call charges, billing terms, required add-ons, and development costs for API-based products.
When live supervisor whisper is the feature you need
Pre-call whisper gives the representative context before the customer conversation begins. Live supervisor whisper allows a manager to privately coach an agent during the conversation.
Teams that need live listening, coaching, barge-in, or supervisor intervention are evaluating a different category. Those requirements belong with call monitoring software rather than the pre-call comparison above.
Frequently asked questions about call whisper software
1. Can the caller hear a call whisper message?
In a standard pre-call whisper workflow, the caller does not hear the private message. The message plays to the receiving person before the caller and representative are connected. CallRail states that only the person answering hears the whisper and that the caller continues to hear ringing while the message plays.
2. Can a call whisper announce a marketing source, campaign, or keyword?
Yes, when the platform has the relevant attribution data. AvidTrak documents campaign, keyword, and source context in its call-whisper and PPC workflows, while CallRail supports source, campaign, keyword, and tag keyphrases. CallScaler also supports dynamic source, campaign, and keyword variables.
3. Can call whisper work with IVR or voicemail?
Call whisper can operate inside a call flow that also uses IVR, routing, or voicemail, but the order of the steps matters.
An automated answering system may pick up before a human representative does. CallRail warns that automated answering services, greetings, and hunt groups can interfere with whisper playback. Teams using automated destinations should test the complete flow before launch.
4. Does call whisper add a delay before the call connects?
A pre-call whisper adds a short message between the receiving party answering and the caller being connected. The exact time depends on the message length and the platform.
CallRail notes that the person answering needs to wait for the whisper to finish before greeting the caller. AvidTrak’s own setup guidance recommends keeping the whisper succinct and under roughly three seconds.
5. Is call whisper the same as call screening?
The terms overlap, but vendors do not always use them in the same way.
Some programmable workflows combine a private pre-connect message with an accept-or-reject decision, while many call tracking platforms use call whisper mainly for a private informational message. The actual call flow therefore matters more than the feature label.
Choose the platform that fits the call workflow and CRM
The right call whisper software should match both sides of the phone-lead process: the context the representative needs before answering and the information the team needs afterward.
A marketing team may prioritize campaign, keyword, and source attribution. An inbound sales team may need CRM activity, recordings, and follow-up context. A pay-per-call operation may prefer campaign identification and acceptance controls. A development team may prefer an API that supports custom caller lookups and routing.
For teams that want pre-call source context, marketing attribution, and direct Salesforce, HubSpot, or Zoho connections, AvidTrak provides a 14-day free trial and a demo option.
The stronger choice is the platform whose whisper context, CRM connection method, post-call data, technical requirements, and pricing model fit the team’s actual phone-lead workflow.
