How do I migrate to Teams telephony?

Are you planning to modernize your phone system by switching to Microsoft Teams Phone? Excellent decision! The migration to telephony via Teams represents a strategic opportunity to unify your communications, reduce your costs and prepare your company for hybrid working.

But how can you make this transition without disrupting your operations? What steps need to be taken? How much time should you allow? This article provides a step-by-step guide to your Teams Phone migration project.

Why migrate to Microsoft Teams Phone in 2025?

Before detailing the process, let’s recall the 3 major reasons why Swiss companies are adopting Teams Phone this year:

1. End of life for traditional telephone systems

Many PBX systems are reaching the end of their support life. Rather than investing in expensive new hardware, migration to Teams Phone offers a future-proof, scalable cloud-based solution.

2. Teleworking and hybrid working are here to stay

Do your employees work from different locations? With Microsoft Teams Phone, they can be reached on their business number from any device, wherever they are. Microsoft Teams Phone naturally follows your teams.

3. Significant cost reduction

Eliminate hardware maintenance, reduce inter-site communication costs and benefit from transparent, predictable pricing. Companies typically see savings of 30-50% on their telephone costs after migrating to Teams Phone.

→ Ready to discover our Microsoft Teams telephony solution?

How long does it take to migrate to Teams Phone?

The total duration of your migration to Microsoft Teams Phone depends on a number of factors. Here are our estimates based on over 150 successful migrations:

Timeline by company size

VSE / Small SME (5-20 users)

• Total duration: 3-4 weeks
• Audit and design: 1 week
• Configuration and testing: 1 week
• Number portability: 10 days (in parallel)
• Training and changeover: 2-3 days

Ideal for: professional offices, shops, small businesses

Medium-sized SMEs (20-100 users)

• Total duration: 6-8 weeks
• Audit and design: 2 weeks
• Configuration and pilot testing: 2 weeks
• Number portability: 15 days (in parallel)
• Wave training: 1 week
• Progressive migration: 1 week

Ideal for: single or multi-site companies, organizations with several departments

Large companies (100-500 users)

• Total duration: 10-14 weeks
• In-depth audit: 3 weeks
• Design and validation: 2 weeks
• Configuration and testing: 3 weeks
• Deployed training: 2 weeks
• Phased migration: 2-3 weeks

Ideal for: large organizations, multi-site structures, complex environments

Very large companies (500+ users)

• Total duration: 4-6 months
• Phase or site approach
• Multiple drivers
• Progressive deployment
• In-depth change management

Factors affecting duration

⏱️ Migration gas pedals

• Modern infrastructure and high-performance network
• Users already familiar with Microsoft Teams
• Simple telephone processes
• Available and committed IT team

⏳ Project extension elements

• Old and complex telephone system
• Numerous industry-specific integrations
• Multi-sites with heterogeneous infrastructures
• Specific regulatory constraints
• Limited availability of test teams

💡 O ur advice: allow a 20% margin on the initial timeline to absorb unforeseen events.

Is it possible to test Teams Phone before the full migration?

Absolutely, and we highly recommend it! The pilot phase is essential to the success of your Microsoft Teams Phone project.

Why is a pilot essential?

1. Technical validation under real-life conditions

• Test call quality in your specific environment
• Check the performance of your Internet and network connection
• Validate integrations with your business tools
• Identify potential technical problems before major deployment

2. Configuration adjustment

• Refine call routing rules according to your workflows
• Optimizing automatic switchboard menus
• Adapting queues to real needs
• Personalize the user experience

3. Organizational learning

• Create internal ambassadors to train their colleagues
• Gather user feedback and adjust training
• Identifying and responding to resistance to change
• Building a FAQ knowledge base

4. Risk reduction

• Detect and correct problems in a small group
• Validate deployment methodology
• Refine communication and change management plan

How do you organize your Teams Phone pilot?

Selection of pilot group (10-25 people)

Profiles to be included :

✅ Management: project sponsor, buy-in needed

✅ IT: technical understanding and support

✅ S ales team: intensive phone use

✅ Customer service/Support: critical use cases

✅ Teleworkers: validating mobility

✅ Early adopters: enthusiasts who will become ambassadors

✅ Skeptics: overcoming objections right from the start

Ensuring diversity :

• Different departments and functions
• Light and intensive phone users
• Offices and teleworkers
• Different generations and levels of technological expertise

Pilot duration: 2-4 weeks

Week 1: Discovery

• In-depth training for the pilot group
• First calls and discovering the interface
• First impressions feedback
• Intensive support available

Week 2: Daily use

• Use under normal conditions
• Test all call scenarios
• Structured feedback via questionnaire
• Configuration adjustments

Week 3-4: Validation and optimization

• Advanced scenario testing
• Integration validation
• Configuration refinement
• Preparing for general deployment

Driver configuration

The pilot group benefits from :

✅ All necessary Teams Phone numbers

✅ A production environment (no sandbox)

✅ Coexistence with current system (can go back)

✅ A dedicated Teams channel for questions and support

✅ Weekly feedback sessions

Validation criteria

Before generalizing, validate that :

✅ Call quality is excellent (MOS score > 4.0)

✅ Pilot users are satisfied (NPS > 8/10)

✅ No blocking bugs identified.

✅ Training is appropriate and sufficient.

✅ Business processes are working properly.

What if the pilot reveals problems?

That’s precisely the point! It’s better to identify problems in 15 people than in 150.

Common problems and solutions :

• Insufficient audio quality → Optimize network QoS, upgrade bandwidth
• Missing functionality → Additional or alternative configuration
• Difficulty of adoption → Reinforced training, personalized guides
• Integration that doesn’t work → Specific development or workaround

💡 The secret: don’t go for general deployment until the pilot group is 100% satisfied and up and running on Teams Phone.

Ready to migrate to Microsoft Teams Phone?

The migration to Teams Phone is a strategic project that deserves to be carried out with method and expertise. By following the 7 steps outlined in this guide and enlisting the support of a certified partner, you can ensure the success of your transition to modern telephony.

The 3 keys to success

✅ Anticipation: Start planning 2-3 months before the desired migration date
✅ Support: Get help from Microsoft-certified experts
✅ Adoption: Invest in training and change management

Your next steps

1. Assess your needs: How many users? Which features are critical?
2. Request an audit: Infologo performs a free audit of your infrastructure
3. Get a quote: Receive a detailed, budgeted proposal
4. Plan your pilot: Test Teams Phone with a small group
5. Launch the migration: Deploy gradually with our support

Your questions about migrating to Teams Phone