Phone Call OTP
Automated voice delivery of one-time numeric codes with configurable length and expiration to validate the recipient's telephone number before a signature is applied.
Phone call authentication provides a user-verifiable identity step that reduces impersonation risk, preserves a clear audit record, and integrates with common eSignature workflows to improve signer confidence and transactional integrity.
A compliance officer reviews authentication settings, documents regulatory justification for phone call verification, and ensures retention and audit processes meet ESIGN and UETA recordkeeping requirements.
A workflow administrator configures phone call authentication, defines PIN length and retry rules, and coordinates integration with telephony providers and the signNow settings for enterprise accounts.
Financial services, real estate firms, HR teams, and healthcare administrators often need stronger signer verification in remote eSignature transactions.
These use cases balance operational needs with compliance requirements and are supported by configurable authentication options in enterprise eSignature platforms.
Automated voice delivery of one-time numeric codes with configurable length and expiration to validate the recipient's telephone number before a signature is applied.
Short message service delivery of one-time passcodes as an alternative fallback, useful for recipients who cannot receive voice calls or prefer text verification.
Adjustable retry count and timeout policies to balance user experience with security, allowing controlled reattempts when calls fail or are unanswered.
Comprehensive event metadata including call timestamps, delivery results, PIN issuance, and signer confirmation to support compliance and dispute resolution.
Role-based settings to enable or restrict who can require phone call authentication and to manage enterprise-wide default authentication policies.
Support for provider configurations, number formatting rules, and international dialing controls to ensure reliable delivery across regions.
signNow integrates with Google Workspace to attach documents directly from Google Drive, preserve document metadata, and launch phone call authentication as part of the send flow for users working in Google Docs or Drive.
Integrations with CRMs such as Salesforce allow contact phone numbers to prepopulate authentication fields, enabling consistent verification steps and reducing manual entry errors for sales and legal teams.
Connections with Dropbox and cloud storage providers let teams pull finalized documents into secure folders and maintain retention policies after phone-verified signatures are applied.
Templates that include phone call authentication settings streamline recurring transactions, maintain consistent authentication rules, and reduce configuration time for common agreements.
| Setting Name | Configuration |
|---|---|
| Authentication Method | Phone call with OTP |
| PIN Length | 6 digits |
| Call Timeout | 120 seconds |
| Retry Attempts | 2 retries |
| Notification Settings | Email on failure |
Phone call authentication requires basic telephony capabilities for the recipient and modern browser or mobile access to complete the signing session and view verification instructions.
Ensure recipients can receive voice calls on the provided number and that corporate telephony policies or device settings do not block automated calls; maintain alternative methods for accessibility and international recipients.
A loan officer enables phone call authentication for remote closing documents to confirm borrower identity before signature is applied.
Resulting in clearer enforceability and reduced fraud risk for mortgage transactions.
An HR team requires phone call confirmation for benefit enrollment forms sent to new hires outside the office.
Leading to more reliable records and improved compliance with internal audit requirements.
| Criteria | signNow (Recommended) | DocuSign | Adobe Sign |
|---|---|---|---|
| Phone call authentication availability | |||
| SMS OTP support | |||
| Audit trail detail | Extensive | Extensive | Extensive |
| HIPAA-ready options | Available | Available with BA | Available with BA |
| Plan | signNow (Recommended) | DocuSign | Adobe Sign | HelloSign | PandaDoc |
|---|---|---|---|---|---|
| Free or Trial | 7-day free trial available | Free trial available | Included with Acrobat trial | Free plan limited to 3 documents | Free eSign plan available |
| Entry Price | $8 per user/month typical | $10+ per user/month entry tier | Included with Acrobat DC business plans | $15 per user/month starter plan | $19 per user/month starting plan |
| Phone Auth Support | Supported as authentication method | Supported via advanced options | Supported via phone OTP integration | Primarily SMS; limited call support | SMS-based OTP only |
| API Access | Full REST API included | Robust REST API available | REST API included with business plans | API available on paid plans | API available on paid plans |
| Compliance | ESIGN, UETA, SOC 2 aligned | ESIGN, UETA aligned | ESIGN, UETA, SOC 2 aligned | ESIGN, UETA aligned | ESIGN, UETA aligned |
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