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Documentation Index

Fetch the complete documentation index at: https://docs.vobiz.ai/llms.txt

Use this file to discover all available pages before exploring further.

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1. Choosing the Right Number Series

Selecting the appropriate number series significantly impacts pickup rates and compliance.

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Standard High-Connectivity

  • 79 Series - Gujarat
  • 80 Series - Karnataka
  • 22 Series - Mumbai
  • 11 Series - Delhi
79 and 80 series numbers generally show higher connectivity because they resemble standard mobile formats and appear familiar to end users.

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Specific Use Cases

  • BFSI Compliance - Use 1600 Series numbers for BFSI-related services to remain compliant.
  • Promotional / Marketing - Use 1400 Series numbers to stay within regulatory guidelines.
  • High Pickup Rate - Consider 92 Series numbers for improved pickup rates.

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2. Daily Call Volume Best Practices

To prevent spam flagging and maintain number health:
  • Avoid exceeding 500–600 calls per number per day.
  • Distribute calls evenly between 9:00 AM and 9:00 PM.
  • Avoid sudden traffic spikes on newly provisioned numbers.
  • Do not concentrate large volumes within short time windows.
Caution: Overstressing a number increases the likelihood of spam classification by carriers and third-party apps.

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3. Warm vs Cold Calling

“Connectivity is significantly higher when calls are warm leads with existing relationships.”
Higher Connectivity Indicators
  • Existing relationship / prior interaction
  • Call duration exceeds 1–2 minutes
  • Natural and meaningful conversations
Risk of Spam Detection
  • Cold calling without opt-in
  • Repetitive dialing patterns
  • Short-duration calls (“hang-ups”)

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4. Number Rotation Strategy

Proactive rotation maintains “number health” and prevents burnout.
1

Daily Limit

Use a specific number once per day where possible to avoid repetitive ID patterns.
2

DID Rotation

Rotate between multiple DIDs (Direct Inward Dialing) on alternate days.
3

Cooling Period

If a number is flagged, pause usage for approximately one week before reattempting traffic.

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5. Spam Recovery Best Practices

  • Pause Traffic: Temporarily stop outbound usage on the flagged number.
  • Legitimate Use: Use the number internally for 5–10 legitimate calls with a 3–5 minute duration.
  • Update Identity: Refresh caller ID information in Truecaller or similar registries.
  • Gradual Reuse: Slowly reintroduce outbound traffic to verify classification status.

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6. Routing & Infrastructure Optimization

Vobiz uses AI-optimized routing to provide the best possible connection quality:
  • Improve call connection stability
  • Reduce spam exposure patterns
  • Optimize network paths dynamically
  • Improve delivery consistency
Routing optimization alone cannot compensate for high-volume abusive patterns. Responsible usage is critical.

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7. Key Compliance Reminders

  1. Use 1600 series for BFSI communication.
  2. Use 1400 series for promotional campaigns.
  3. Avoid random or scraped lead databases.
  4. Ensure opt-in consent where required.
  5. Maintain controlled and predictable calling patterns.

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8. High-Volume Warm Calling Guidelines

“If you are running warm call campaigns (existing customers, verified opt-ins, verified prior interaction), higher daily call volumes can be supported safely.”
  • Permitted Volume - Daily volumes of 1,000 to 10,000 calls per number may be executed for verified warm leads.
  • Window Management - Calls must be distributed evenly across the 9:00 AM – 9:00 PM window. Avoid burst dialing.
  • Sustainable Success - Success is sustainable only when lead data is verified and recipients are familiar with your brand.
  • Natural Patterns - Maintain meaningful call durations and natural conversation flows to signal legitimacy to carriers.
Important: Aggressive cold dialing at high volumes may result in increased spam flagging and reduced number health. Always prioritize lead quality and opt-in status.

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Additional Resources

Vobiz Dashboard

Manage Phone Numbers, Configure SIP Trunks, Billing & Balance.

Numbers API Guide

REST API to list, purchase, and manage DID numbers.

Trunks Configuration

Provision trunks, credentials, IP ACLs, and origination URIs.

General Best Practices

Security, performance, reliability, and monitoring guidance.
Sustainable call performance requires balance. Following these guidelines ensures long-term number health and maximum connection rates for your communications infrastructure.