> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vodex.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# ⚙️ Call Settings Overview
> Configure your AI calling campaigns with advanced call settings, AI models, voice options, and transfer capabilities
# Call Settings Overview
**What you'll learn:** How to configure call settings including transfer numbers, AI models, voice options, caller ID, and call management features for optimal campaign performance.
## Core Call Settings
### Call Transfer Number
The phone number or SIP URI that your AI bot will transfer calls to when needed.
**Standard Phone Number Format**
Enter the phone number without the `+` prefix:
```
12185262990
```
The system will automatically format the number with the appropriate country code during call processing.
**SIP URI Format**
For SIP-based transfers, use the standard SIP URI format:
```
sip:username@domain.com
sip:12185262990@sip.provider.com
```
SIP URIs must start with `sip:` to be recognized by the system.
**Custom Trunk and DID**
For advanced setups with custom trunks and Direct Inward Dialing (DID):
* **Open field configuration** allows flexible routing
* **Custom trunk integration** for enterprise solutions
* **DID mapping** for specific number routing
Contact [support@vodex.ai](mailto:support@vodex.ai) for custom trunk configuration assistance.
***
### Disconnect Call Automatically
Automatically disconnect calls after a specified duration to prevent misuse and control costs.
#### **Why Use Auto-Disconnect?**
**Protection Against Misuse**
* Stops people from playing with your bot indefinitely
* Prevents unnecessary resource consumption
* Maintains professional call handling
**Cost Management**
* Limits maximum call duration charges
* Prevents runaway costs from stuck calls
* Ensures predictable billing
**Resource Optimization**
* Frees up system resources for legitimate calls
* Maintains optimal performance
* Reduces server load
#### **Configuration Options**
| Duration | Use Case | Recommended For |
| ----------------- | ---------------------------- | ---------------------- |
| **2-3 minutes** | Quick surveys, confirmations | Simple interactions |
| **5-7 minutes** | Customer service, support | Standard conversations |
| **10-15 minutes** | Sales calls, consultations | Complex discussions |
| **Custom** | Specialized use cases | Enterprise needs |
***
### Gateway Configuration
The communication gateway through which your calls are routed and processed.
#### **Default Gateway Options**
**Included with all plans:**
* Vodex default gateway (Only for testing)
* Standard SIP routing
* Basic call management
* Standard quality assurance
#### **Custom SIP Integration**
**Available for paid tiers:**
* Custom SIP provider integration
* Enterprise-grade routing
* Advanced call management
* Dedicated support
**To integrate:** Contact [support@vodex.ai](mailto:support@vodex.ai)
**Need SIP Trunk Integration?** Check our comprehensive [SIP Trunk Requirements Guide](/faqs/sip-trunk-requirements) for detailed technical requirements, configuration examples, and integration steps.
***
## AI Model Selection
Choose the AI model that best fits your use case and performance requirements.
### Out-of-the-Box Models
Professional AI models ready for immediate use:
**Anthropic Claude Series**
| Model | Best For | Characteristics |
| ----------------- | ----------------------------- | -------------------------------- |
| **Claude Haiku** | Quick responses, simple tasks | Fast, efficient, cost-effective |
| **Claude Sonnet** | Balanced conversations | Good reasoning, natural dialogue |
**Ideal for:**
* Customer service interactions
* Appointment scheduling
* Information gathering
* Professional conversations
**OpenAI GPT Series**
| Model | Best For | Characteristics |
| ----------------- | ------------------------- | ------------------------------------------ |
| **GPT-3.5 Turbo** | General conversations | Fast, reliable, cost-effective |
| **GPT-4** | Complex reasoning | Advanced understanding, detailed responses |
| **GPT-4 Turbo** | Long conversations | Extended context, efficient processing |
| **GPT-4o** | Multimodal interactions | Vision, audio, text capabilities |
| **GPT-4o Mini** | Lightweight multimodal | Fast multimodal processing, cost-effective |
| **GPT-5** | Next-generation AI | Advanced reasoning, enhanced capabilities |
| **GPT-5 Mini** | Efficient next-gen | Optimized performance, faster responses |
| **GPT-5 Chat** | Conversational excellence | Specialized for dialogue, natural flow |
**Ideal for:**
* Sales conversations
* Technical support
* Detailed consultations
* Multi-step processes
* Multimodal applications
* Next-generation AI experiences
**Meta Llama Series**
| Model | Best For | Characteristics |
| -------------- | ----------------------- | ------------------------------------ |
| **Llama 2** | Open-source flexibility | Customizable, privacy-focused |
| **Llama 3** | Enhanced performance | Improved reasoning, better responses |
| **Code Llama** | Technical discussions | Programming, technical support |
**Ideal for:**
* Technical conversations
* Privacy-sensitive applications
* Custom implementations
* Specialized domains
### Vodex Optimized Models
Specially tuned models optimized for calling scenarios:
**Vodex Spark Models**
Based on Vodex's custom architecture, optimized for voice conversations:
| Model | Optimization |
| -------------------- | --------------------------------------------- |
| **Spark** | Balanced performance for professional calls |
| **Spark Flash** | Ultra-fast responses, real-time conversations |
| **Spark Flash Lite** | Lightweight, cost-effective interactions |
**Spark Foundation**
* **Advanced reasoning** for complex conversations
* **Multimodal capabilities** for rich interactions
* **Large context window** for detailed discussions
* **High accuracy** in understanding and responses
**Spark Flash Foundation**
* **Ultra-low latency** for real-time conversations
* **Efficient processing** for high-volume campaigns
* **Optimized for speed** without sacrificing quality
* **Cost-effective** for large-scale operations
**Spark Flash Lite Foundation**
* **Minimal resource usage** for simple interactions
* **Maximum cost efficiency** for basic conversations
* **Quick deployment** for straightforward use cases
* **Reliable performance** for standard scenarios
**Model Selection Guide:** Choose Spark for complex sales calls, Spark Flash for customer service, and Spark Flash Lite for simple confirmations or surveys.
***
## Voice Configuration
Select from premium voice providers to create the perfect audio experience for your calls.
### Available Voice Providers
**Premium AI Voices**
**Features:**
* Ultra-realistic voice synthesis
* Multiple voice personalities
* Emotional expression capabilities
* Multiple languages and accents
**Model Recommendations:**
* **For English:** Select ElevenLabs Turbo v2 or ElevenLabs Flash V2
* **For Multi-lingual:** Use ElevenLabs Flash 2.5 or Turbo 2.5 to get proper accent
**Availability:** ✅ **Included with all plans**
**Best for:**
* Professional business calls
* Customer service interactions
* Sales conversations
* Any scenario requiring natural-sounding voices
**Advanced Voice Technology**
**Features:**
* High-quality voice synthesis
* Natural conversation flow
* Specialized voice models
* Custom voice training options
**Availability:** 📞 **Contact support for access**
**Best for:**
* Specialized industry applications
* Custom voice requirements
* Enterprise implementations
**Microsoft Azure Voices**
**Features:**
* Enterprise-grade reliability
* Global language support
* Neural voice technology
* SSML support for fine control
**Availability:** 📞 **Contact support for access**
**Best for:**
* Enterprise applications
* Multi-language campaigns
* Integration with Microsoft ecosystem
**Google Cloud Text-to-Speech**
**Features:**
* WaveNet technology
* Ultra-realistic voices
* Multiple languages and variants
* Custom voice models
**Availability:** 📞 **Contact support for access**
**Best for:**
* High-quality voice requirements
* Global campaigns
* Google Cloud integrations
**Voice Provider Access:** While ElevenLabs is available by default, access to RimeLabs, Azure, and Google voices requires contacting [support@vodex.ai](mailto:support@vodex.ai) for configuration.
***
## Voicemail Detection
Advanced voicemail detection system to optimize call handling and costs.
### How It Works
**Voice Activity Detection Technology**
* Non-LLM based detection system
* Works across all countries and languages
* Independent of ASR, LLM, and voice settings
* **85% accuracy rate** in standard conditions
**Optimized Detection Timing**
* Bot starts speaking after **10 seconds** of voicemail detection
* Allows for various voicemail greeting lengths
* Reduces false positives from long greetings
**Enhanced Accuracy with Beep Recognition**
* Detects voicemail beep signals
* Restarts message delivery after beep detection
* Ensures **90% voicemail drop success rate**
* Maximizes message delivery effectiveness
### Cost Structure
| Scenario | Charge | Explanation |
| ------------------------------------- | ----------------- | --------------------------------- |
| **Voicemail Detected + Disconnected** | **3 cents** | Call ends without leaving message |
| **Voicemail Detected + Message Left** | **3 cents** | Successful voicemail delivery |
| **Live Person Answered** | **Standard rate** | Normal conversation charges apply |
**Cost Optimization:** The 3-cent voicemail charge is significantly lower than full conversation rates, helping you manage costs while maintaining campaign effectiveness.
***
## Caller ID Configuration
### Twilio Caller ID Management
**Twilio Exclusive Feature:** Caller ID configuration is only available when using Twilio as your gateway provider.
**Geographic Limitation:** Only US and Canada Caller IDs are supported for Twilio. For custom trunks, please check with your trunking provider on supported caller IDs.
#### **How Twilio Caller ID Works**
Twilio's Caller ID system allows you to display specific phone numbers to recipients, improving answer rates and call legitimacy.
#### **Configuration Requirements**
**Verify Your Numbers**
* All caller ID numbers must be verified with Twilio
* Verification prevents spoofing and ensures compliance
* Process typically takes 24-48 hours
**Regulatory Compliance**
* Follow local telecommunications regulations
* Ensure proper business registration
* Maintain accurate caller identification
**Optimize Number Usage**
* Rotate between verified numbers
* Match caller ID to campaign type
* Monitor number reputation and performance
#### **Best Practices**
**Caller ID Strategy:** Use local numbers for regional campaigns, toll-free numbers for national campaigns, and business numbers for professional services.
| Campaign Type | Recommended Caller ID | Benefits |
| -------------------- | ----------------------- | ------------------------------------------------- |
| **Local Business** | Local area code numbers | Higher answer rates, local trust |
| **National Service** | Toll-free numbers | Professional appearance, no charges to recipients |
| **Customer Service** | Main business line | Brand recognition, established trust |
| **Sales Outreach** | Dedicated sales numbers | Call tracking, performance measurement |
***
## Next Steps
Now that you understand call settings:
1. **Configure your transfer number** based on your routing needs
2. **Select the appropriate AI model** for your use case
3. **Choose your voice provider** (contact support for premium options)
4. **Set up voicemail detection** to optimize costs
5. **Configure caller ID** if using Twilio
**Ready to optimize your calls?** Proper call settings configuration ensures professional, cost-effective, and successful AI calling campaigns. Take time to configure each setting according to your specific needs.
***
**Need advanced configuration?** Check out our [Advanced Settings](/call-settings/advanced-settings) guide for language codes, ASR options, webhooks, and transfer configurations.