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Karsten Kreh

Karsten Kreh, Co-Founder & Product Guy

Karsten Kreh

Co-Founder & Product Guy

Karsten is the co-founder and product lead of Safina AI, shaping the product experience for professionals who need reliable call handling.

Blog Articles

24/7 Availability for IT Services: How to Offer Round-the-Clock Support

Offer 24/7 IT services without overloading your team. Learn how to achieve cost-effective round-the-clock availability with an AI assistant.

High-Risk or Not? How to Correctly Classify Your AI-Powered Customer Service

Does your AI chatbot fall under 'high-risk'? Learn about the AI Act's risk categories and how to correctly classify your AI customer service to avoid unnecessary effort.

AI Act & Customer Service: Why Transparency for AI Phone Assistants Is Now Mandatory

The EU AI Act's transparency requirements explained simply. Learn why you must be transparent when using AI chatbots and phone assistants, and how to implement it.

Customer Satisfaction on the Phone: How AI Assistants Improve the Service Experience

Boost customer satisfaction on the phone. Learn how Conversational AI brings classic service virtues like patience and personalization to life through technology.

Automated Prescription Ordering by Phone: More Time for Your Patients

Prescription orders by phone tying up your practice staff? Learn how to easily automate this process and free up more time for patient care.

The Best Text-to-Speech (TTS) Providers in 2025: A Comparison Guide

Compare the top TTS providers of 2025 by voice quality, latency, pricing, and features – from ElevenLabs to Resemble AI. Find the perfect voice for your application.

Discretion in Call Handling: Ensuring Data Protection for Lawyers

Ensure absolute discretion in call handling at your law firm. Here's how to protect sensitive client data and meet all data protection requirements.

Chatbot vs. Conversational AI: Why the Difference Matters for Your Customer Service

What's the difference between a chatbot and Conversational AI? Learn why this distinction is critical for the quality of your customer service.

Conversational AI: An Accessible Guide for Business Use

What is Conversational AI? Our guide explains the technology, its benefits for businesses, and key aspects like security and GDPR for deployment in Germany.

Efficient Call Management: A Practical Guide for Businesses

Optimize your call management. This guide shows you how to improve customer reachability and streamline processes with the right strategies and software.

Better Availability for Electrician Emergency Services

Boost the availability of your electrician emergency service. Learn how to never miss an emergency call — even at night and on weekends — and help customers fast.

Protecting Focus Time: How to Eliminate the 5 Biggest Phone-Related Time Wasters

Minimize phone interruptions. This guide reveals the 5 most common time wasters and gives you practical strategies — from simple behavioral tips to technical solutions.

Optimizing Customer Communication: Tips for Heating Installers

Improve your customer communication as a heating installer. Learn how to respond professionally over the phone and boost customer satisfaction.

The EU AI Act: A Practical Guide for German Businesses

The EU AI Act explained simply: our guide for German businesses. Understand the new obligations, risk categories, and opportunities of the EU's AI regulation.

First Call Resolution (FCR): The Most Important Metric for Your Customer Service

Learn what First Call Resolution (FCR) is and why this metric is critical for customer satisfaction and efficiency. Discover how to improve your FCR rate.

Focus Time Over Interruptions: A Guide to Greater Productivity and Deep Work in Business

How do you protect your focus time at work? This guide shows you methods for greater productivity and how to control the biggest disruptor — the phone.

GDPR-Compliant? Perfect! How Your Data Privacy Strategy Prepares You for the AI Act

Learn how the AI Act and GDPR work together. Use your existing data privacy strategy as the perfect foundation for the EU's new AI regulation.

Free Router Choice: What You Need to Know as a German Business

Exercise your rights! Learn what Germany's 'free router choice' law means for your business, the advantages it offers, and how you can take control of your IT infrastructure.

Inside Safina AI, Part 1: The Core Architecture for Real-Time Voice AI

Discover how Safina AI enables real-time voice AI with low latency – from STT to LLM to TTS, perfectly integrated for your business.

Inside Safina AI, Part 2: The Brain – Context vs. RAG for Business Knowledge

Learn how Safina AI uses in-context memory and RAG to access business knowledge quickly and deeply – for precise, natural real-time conversations.

Inside Safina AI, Part 3: The Senses – High-Precision Speech-to-Text (STT)

Learn how Safina AI understands speech with high-precision real-time STT – multilingual, accent-robust, and noise-suppressed for natural AI call center conversations.

Inside Safina AI, Part 4: Human-Like Text-to-Speech (TTS) with Low Latency

Discover how Safina AI speaks with a natural, brand-consistent voice in real time – powered by low-latency TTS, voice cloning, and emotional speech delivery.

IVR vs. Conversational AI: Why Your Phone System Frustrates Your Customers

"Press 1" is yesterday's solution. Learn the fundamental difference between legacy IVR systems and modern Conversational AI like Safina -- and why the latter boosts customer satisfaction.

Client Communication in Your Law Firm: Efficient and Discreet

Optimize client communication in your law firm. Learn how to stay reachable by phone, work efficiently, and maintain absolute discretion at the same time.

Meeting Deadlines Reliably: How Lawyers Can Turn the Phone Into a Powerful Tool

Meet deadlines reliably as a lawyer and reduce stress. Learn how to use your call management to ensure you never jeopardize a procedural deadline again.

Managing Appointment Pressure in Your Practice: How to Turn the Phone From a Stress Factor Into a Helper

Is your practice suffering from appointment pressure due to constant phone calls? Discover solutions to optimize scheduling and reduce patient wait times.

Managing IT Support Calls: How to Bring Order to Ticket Chaos

Learn how to manage IT support calls efficiently and filter them by urgency. Optimize your response times and boost customer satisfaction.

Modern Business Communication: A Guide to Effective Customer Service

This guide to modern business communication shows you how to improve phone-based customer support and strengthen customer loyalty through a smart AI-human balance.

Job Applicant Inquiries by Phone: How to Pre-Screen Candidates Automatically

Efficiently pre-screen phone-based applicant inquiries and save time. Learn how to automatically filter out unsuitable candidates and focus on top talent.

Pre-Qualifying Patient Calls: The Key to an Efficient Practice

Learn how to pre-qualify patient calls and sort them by urgency. Optimize your practice workflows, reduce stress, and improve patient care.

Professional Phone Greetings: Examples and a Better Alternative

Looking for examples of professional phone greetings? We show you classic templates and a modern, AI-powered alternative that actually answers calls.

Prompting for Your IT Support: Field-Tested AI Dialogues with Safina

How can structured AI dialogues improve IT support? Learn how field-tested prompts, targeted questions, and smart evaluations make everyday work easier for IT service providers, system integrators, and MSPs – with real-world examples and tips.

Prompting for Your Physiotherapy Practice: Field-Tested AI Dialogues with Safina

How do AI dialogues work for phone services in physiotherapy? Learn how structured prompts, smart assessments, and clear rules can simplify your daily practice operations — with real-world examples and practical tips.

Prompting for Property Management: Field-Tested AI Dialogues

How can structured AI dialogues improve phone services in property management? Learn how Safina can simplify daily operations for property managers, real estate administrators, and homeowner associations — with real-world examples and practical tips.

Property Viewings: Less Chaos, No No-Shows

Schedule property viewings stress-free. Learn how to optimize appointment planning, reduce frustrating no-shows, and keep your calendar under control.

Building Trust: The Psychology Behind a Good AI Voice

A good AI voice doesn't try to be human. Learn how Safina earns your callers' trust through transparency, competence, and smart conversation design.

Real Estate Inquiries by Phone: How to Qualify Leads Automatically

Automatically qualify phone-based real estate inquiries and save valuable time. Learn how to filter out unsuitable leads and focus on top prospects.

Is a Receptionist Worth It? The Modern Cost-Benefit Analysis

What does a receptionist really cost? We break down the full personnel costs -- from salary and social contributions to hidden expenses -- and compare them with modern alternatives like Safina AI.

The ROI Calculator: Calculate the Value of Safina AI for Your SMB

Is Safina AI an expense or an investment? Use this simple ROI calculator to quantify the financial value of Safina for your SMB -- based on time saved and revenue recovered.

How Safina Connects SIP and PSTN for Intelligent Call Management

Learn how Safina uses Twilio Elastic SIP Trunking to bridge PSTN and VoIP for intelligent call management – secure, scalable, and AI-powered.

Scheduling Interviews Without the Email Back-and-Forth

Schedule job interviews efficiently and reduce coordination effort. Discover how to easily coordinate appointments with candidates and hiring managers.

Your Voice Matters: Help Shape the Future of Safina!

We're building Safina for you — and with you! Discover our new Feature Forum where you can submit ideas, vote on new features, and actively shape Safina's roadmap.

How Tradespeople Can Handle Peak Demand Over the Phone

Struggling with phone call surges in your trade business? Learn how to efficiently manage calls even on the job site and never miss a potential contract again.

Trust as Currency: Why 'Made in Germany' Is Crucial in the Age of the AI Act

Why a 'Made in Germany' AI solution is a strategic advantage in the age of the AI Act. Learn how data sovereignty and legal certainty build trust.

What Is a Webhook? A Simple Explanation for Automating Your Business Processes

What is a webhook and how does it work? Our guide explains it simply with examples, showing you how to connect your business apps and automate processes using webhooks.

What Is Call Routing? A Clear Explanation for Better Customer Service

What is call routing? Learn in simple terms how intelligent call distribution works and how it makes your customer service more efficient and customer-friendly.

Docs & Guides

Book Appointments During the Call: Safina AI's Calendar Integration

Learn how Safina AI's calendar integration automatically books appointments in your Google or Microsoft calendar. Set up direct appointment booking now!

The Basics: How Call Forwarding to Safina Works

Understand the technology behind Safina. We explain in simple terms what call forwarding (or call diversion) is, how it uses your Safina number, and when it takes over your calls.

Safina Call Forwarding Not Working?

Your calls aren't being forwarded to Safina? This troubleshooting guide shows you how to fix the issue on your mobile phone in 2 steps and what Apple users need to watch out for.

The Safina Call List: Filtering and Finding Calls Quickly

Stay on top of your calls. This guide shows you how to use the call list in your Safina app, spot new messages, and use filters to quickly find what you're looking for.

Call Summaries & Notifications Explained

Learn what Safina AI call summaries contain, how fast notifications arrive, CRM integration options, and how to customize what gets captured during each call.

Call Transfer to an External Number: How to Use the "Human-in-the-Loop"

Use Safina AI's intelligent call transfer to flexibly hand off callers to an external number. Learn how to configure the "Human-in-the-Loop" feature here.

Changing Your Personal Information and Password in Safina

Has your information changed? This short guide shows you how to quickly and easily update your name or password in the Profile tab of your Safina app.

Controlling Conversation Flows with Scenarios

Bring structure to your calls. Learn how to use scenarios in the conversation guide to define different call reasons (e.g., 'Emergency,' 'Quote') and ask the right questions for each case.

Crafting the Perfect Greeting and Icebreaker

First impressions matter. Learn how to craft the optimal greeting and 'icebreaker' sentence for your Safina assistant to welcome callers professionally and clearly.

Creating New Questions and Instructions in the Conversation Guide

Capture the right data. Learn step by step how to create custom instructions and structured questions (yes/no, text, date, etc.) for your Safina in the conversation guide.

Let Safina Create Custom AI Evaluations in the Background

Go beyond standard analysis. Learn how to create custom AI evaluations that analyze conversations in the background for characteristics like emergencies or revenue potential.

Custom Names for Your Safina: How to Personalize Your AI Assistant

Give your phone assistant a personal identity. Learn how to customize the name of your Safina.

Customizing Your Safina's Voice and Tone

Give your AI assistant a personal touch. Learn how to choose your Safina's voice and adjust its tone — from formal to casual.

Deactivating Safina for Individual Contacts

Not every call should go to your AI assistant? Learn how to easily deactivate Safina for specific contacts like family or VIP clients so they can always reach you directly.

Importing and Managing Contacts in the Safina App

Learn how to import your address book into the Safina app. This way, you'll see the caller's name directly in your call list and can assign interactions more easily.

Industry Templates: The Perfect Safina Configuration in One Click

Save time with field-tested templates. Learn what industry templates are and how to apply a ready-made configuration for tradespeople, practices, law firms & more to your Safina with a single click.

Where Can I Find My Invoices? Subscriptions & Additional Minutes Explained

Accounting made easy: Learn where to find your invoices for Safina subscriptions and additional minutes — whether through the App Store or the web app.

Additional Minutes: How Pay-as-you-go Billing Works

Don't want to miss any more calls when your included minutes run out? Discover Safina AI's flexible pay-as-you-go model for full availability.

Payment Methods & Business Invoicing: Everything for Your Accounting

Learn how to add your business details like your VAT ID and choose the right payment method (e.g., SEPA direct debit) in the Safina Web App.

What Happens When My Minute Allowance Runs Out?

Running low on minutes? No worries. We explain what happens when your allowance is used up, how we warn you in advance, and how your calls are still handled safely.

How Does Safina Recognize an Appointment Request During a Call?

Learn how Safina's AI works. We explain how your assistant automatically detects appointment requests during calls by understanding context and key phrases.

Record Safina Calls as Audio Files

Want to save entire conversations as audio files? Learn how to enable call recording in Safina and what you need to know about legal requirements (including automatic consent).

The Safina AI App: A Tour of All Features

Find your way around instantly. This tour of the Safina AI dashboard shows you the four main sections: Calls, Safina AI, Contacts, and Profile. Learn where to find what.

Safina AI on All Devices: iOS, Android & Web App Overview

Access Safina from anywhere. Learn how to use Safina as a native app for iOS and Android or directly in your web browser on your PC or tablet — for full flexibility.

How to Set Up Your Booking Link in Safina

Turn calls directly into appointments. Learn how to add your booking link from Calendly, Microsoft Bookings & more to Safina, so your AI assistant can send it via SMS.

Set Up Call Notifications via Email & Push

Stay in the loop at all times. Learn how to configure whether you receive call summaries via email, as push notifications, or both in the Safina app.

Set Up Safina AI for Your Landline (Fritz!Box, Telekom & More)

Set up Safina for your landline connection. This central guide shows you the best methods for Fritz!Box, Telekom, Vodafone & o2, and links to the detailed step-by-step instructions.

Set Up Call Forwarding From Your Mobile Phone to Safina

Activate Safina for your mobile phone. This simple guide shows you how to set up call forwarding for your iOS or Android device with just one click in the app.

Set Up Call Forwarding to Safina on Your PBX System

Connect your office PBX system with Safina. This general guide gives you tips on where to find the call forwarding settings on your local phone system.

How to Upgrade Your Safina AI Subscription

Need more minutes or advanced features? This guide shows you how to easily upgrade your Safina AI subscription in the Profile tab of your app and unlock more capabilities instantly.

What Is Safina AI? A Complete Overview of All Features

Wondering what Safina AI actually is? Discover your new AI phone assistant that answers calls, filters spam & more. Get to know all its powerful features!

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