25 Cloud Security Best Practices Every Business Should Follow

Cloud Security Best Practices Article Summary

1. Cloud security protects cloud-hosted data, applications, and communications through identity management, encryption, governance, threat detection, and regulatory compliance.
2. Cloud telephony security relies on a shared responsibility model in which the provider secures the infrastructure and platform, while the company manages users, passwords, permissions, MFA, and devices.
3. VoIP and UCaaS systems require specific safeguards against toll fraud, call interception, SIP spoofing, and service disruption, alongside strong internal security practices and regulatory controls.

Cloud security brings together the set of technologies, processes, and best practices that protect data, applications, and infrastructure hosted in cloud environments. Understanding how cloud security works is key to reducing risk, preventing unauthorised access, and ensuring business continuity.

Cloud security is the cybersecurity discipline dedicated to protecting data, applications, and infrastructure hosted in cloud computing environments against unauthorised access and external threats.

For business communications, such as VoIP telephony and UCaaS platforms, this concept carries particular importance: protecting every call, recording, and piece of metadata is just as important as protecting the infrastructure that supports them. The cloud brings flexibility, but it also creates security challenges that must be managed carefully.

25 Essential Cloud Security Best Practices

1. Enable multifactor authentication on every account

MFA adds a critical layer of protection if passwords are stolen, guessed, or reused.

2. Apply the principle of least privilege

Give each user access only to the systems, data, and features they need to perform their role.

3. Use role-based access controls

Organize permissions by job function so access remains consistent, manageable, and easier to audit.

4. Review user permissions regularly

Remove unnecessary access when employees change roles, leave the company, or no longer need certain privileges.

5. Enforce strong password policies

Require long, unique passwords and discourage password reuse across business and personal accounts.

6. Secure administrator accounts separately

Admin accounts should have stricter controls, stronger authentication, and limited everyday use.

7. Encrypt data in transit

Use secure protocols such as TLS and SRTP to protect calls, messages, files, and platform activity while data moves between systems.

8. Encrypt data at rest

Stored data such as recordings, logs, transcripts, backups, and customer records should remain protected even if storage is compromised.

9. Monitor account activity and access logs

Track logins, permission changes, downloads, configuration updates, and unusual access patterns.

10. Set up alerts for suspicious behavior

Unusual login locations, repeated failed login attempts, abnormal call volumes, or unexpected data exports should trigger immediate review.

11. Protect APIs and integrations

Use secure authentication, limit API permissions, rotate keys, and remove integrations that are no longer needed.

12. Segment cloud environments and networks

Separate voice traffic, business applications, sensitive data, and administrative systems to limit the impact of a breach.

13. Keep applications and systems updated

Apply patches quickly to reduce exposure to known vulnerabilities.

14. Back up critical cloud data

Maintain reliable backups of essential records, call logs, recordings, configurations, and business data.

15. Test recovery procedures

Backups are only useful if they can be restored quickly and correctly during an outage, attack, or accidental deletion.

16. Define clear data retention rules

Store data only for as long as it is needed for legal, operational, or compliance purposes.

17. Control access to call recordings and transcripts

Recordings and transcriptions may contain sensitive information, so access should be restricted and monitored.

18. Train employees on phishing and social engineering

Many cloud breaches begin with a human mistake, so staff should know how to recognize suspicious emails, links, calls, and login prompts.

19. Secure employee devices

Laptops, phones, and tablets used to access cloud tools should have screen locks, updates, endpoint protection, and remote wipe capabilities.

20. Use approved communication channels only

Sensitive business or customer information should not be shared through unmanaged messaging apps, personal email, or unsecured devices.

21. Assess provider security before signing

Review encryption, certifications, data hosting, access controls, uptime commitments, incident response processes, and contractual safeguards.

22. Clarify the shared responsibility model

Understand exactly which security controls are managed by the provider and which remain your company’s responsibility.

23. Maintain an incident response plan

Define who investigates alerts, who communicates internally, who contacts the provider, and what steps are taken after a suspected breach.

24. Audit cloud configurations regularly

Misconfigured permissions, exposed storage, inactive users, and excessive access rights are common sources of risk.

25. Build security into everyday workflows

Cloud security works best when it is part of onboarding, offboarding, procurement, IT administration, compliance reviews, and employee training.

What Is Cloud Security Applied to Communications?

Cloud security is not a single or uniform concept. It differs from traditional cybersecurity, which relied on a clearly defined network perimeter, because it operates in distributed and dynamic environments where resources can be created, modified, or deleted instantly. It is a specialised branch of cybersecurity focused on the challenges of hybrid and multi-cloud environments [1].

Applied to cloud telephony, this discipline is made up of several pillars that form the core of cloud security:

• Identity and access management (IAM). Controls who can log in, make calls, or access recordings. In a phone system, this means only authorised staff can view a customer’s conversation history.
• Data encryption. Protects communications both in transit, during the call, and at rest, when recordings are stored. Data must also be encrypted when stored in a database or cloud storage service.
• Governance. Brings together the threat prevention, detection, and mitigation policies that govern use of the platform.
• Threat detection. Involves continuous monitoring of voice traffic to identify abnormal patterns, such as suspicious spikes in international calls.
• Regulatory compliance. Ensures that communications are processed in accordance with legal frameworks such as the GDPR.

Each of these components becomes a specific layer of protection for your phone system. Their combined effect is what separates a secure platform from a vulnerable one.

The Shared Responsibility Model in Cloud Telephony

Cloud security does not fall exclusively on the provider. It is a joint effort between the company delivering the service and the company using it. Securing these systems requires efforts from both cloud providers and the customers who use them, whether that customer is an individual or a business [2].

In a SaaS or UCaaS model, such as cloud telephony, the provider assumes most of the technical burden, but the customer retains key responsibilities over usage and configuration [3].

Who’s Responsible for Cloud Phone System Security, Client or Provider?

Provider Responsibilities (Ringover)

In a cloud telephony solution like Ringover, the provider is responsible for protecting the technical infrastructure on which the service runs. This includes data centres, network security, platform availability, system redundancy, and ongoing application maintenance. In other words, your company does not have to manage physical servers, on-premise PBX systems, security updates, or complex service continuity mechanisms.

Ringover also applies protection measures at the platform level, such as communication encryption, infrastructure monitoring, and mechanisms designed to ensure service stability. This technical layer is essential in a business phone system, since calls, messages, and related data must travel through a secure, reliable environment designed to prevent outages.

Another key provider responsibility is keeping the application updated and protected against vulnerabilities. Unlike an on-premise PBX, where the company must apply patches, maintain servers, and configure backup systems, a SaaS solution like Ringover centralises this technical burden in the hands of the provider. This allows teams to focus on their everyday use of telephony without taking on the management of complex infrastructure.

Customer Responsibilities (Your Company)

Your organisation controls how the platform is used. This includes managing user access, with strong passwords and multifactor authentication, configuring permissions according to each role, securing the devices used to access the service, and complying with internal policies. A provider can encrypt every call, but if an employee reuses a weak password, the breach starts on the customer side.

Specific Threats in VoIP and UCaaS Telephony

Voice over IP communications present risks that do not appear in a generic cloud analysis. Knowing them is the first step toward mitigating them [4].

• Toll fraud. Attackers hijack the phone system to make unauthorised calls to premium-rate or international numbers. The result is often an enormous bill within a matter of hours.
• Call interception, or eavesdropping. Without proper encryption, a third party can listen to confidential conversations, exposing business data or customers’ personal information.
• SIP spoofing. This involves falsifying the identity of the origin of a call. It is used to deceive employees, commit fraud, or impersonate executives in social engineering attacks.
• Denial-of-service attacks (DoS). These attacks saturate the network with malicious traffic until the phone service becomes unavailable. For a business that depends on the phone for sales or customer service, a prolonged outage has a direct cost.
• Caller ID spoofing and robocall compliance. VoIP security should also address caller ID spoofing, robocall mitigation, and call authentication. The FCC’s STIR/SHAKEN framework is designed to authenticate caller ID information for calls carried over IP networks, helping reduce illegal spoofing and improve trust in voice communications.

These threats concentrate the most specific risks of the voice environment. The good news is that all of them have proven countermeasures.

Best Practices to Protect Your Cloud Phone System

Cloud security depends heavily on specific actions you can implement today. Use this checklist as a starting point:

• Activate multifactor authentication (MFA) on all user accounts. It is the most effective barrier against unauthorised access.
• Apply strong passwords and periodic rotation policies to prevent compromised credentials.
• Configure permissions according to the principle of least privilege. Each user should access only what is strictly necessary for their role.
• Verify end-to-end encryption for communications through SRTP protocols for voice and TLS for signalling and data.
• Segment the network to isolate voice traffic from the rest of corporate traffic and reduce the attack surface.
• Train employees to recognise phishing and other social engineering tactics. Regular access reviews are an essential part of comprehensive identity administration.
• Back up critical data such as recordings and call logs.

These measures cover the customer side of the shared responsibility model. Combined with a strong provider, they substantially reduce risk.

Compliance and Data Sovereignty in Communications

Regulatory compliance is just as important as encryption, especially in the European and Spanish context.

The GDPR regulates how you must store and manage communication data: call recordings, transcriptions, and metadata all fall squarely within its scope. Each of these elements may contain personal information, so processing them requires consent, retention limits, and appropriate technical measures.

Data sovereignty is the principle that information is subject to the laws of the country where it is stored or processed. In practice, this means that if your recordings are hosted on servers outside the European Union, they could be exposed to foreign legislation, even if your company operates in the UK or another European country. Knowing where your data physically resides stops being a technical detail and becomes a legal issue.

This is where the concept of a sovereign cloud comes into play: an environment that guarantees all data is stored, processed, and managed exclusively within the borders of a specific jurisdiction. For sectors such as public administration, healthcare, or critical infrastructure, this guarantee of jurisdictional control is essential.

How Ringover Ensures Maximum Security for Your Communications

Ringover addresses each of the challenges above with concrete and verifiable measures.

1. End-to-End Encryption

Calls are protected with DTLS-SRTP, while API communications are encrypted through HTTPS (TLS). Every conversation and every data exchange travels protected.

2. EU Data Hosting

European customer data is hosted exclusively in data centres located in Europe, ensuring GDPR compliance and data sovereignty. In addition, Ringover’s AI solutions are developed entirely by its team in Europe, reinforcing that protection.

3. Key Certifications

Compliance with recognised standards such as ISO 27001, HDS, and PCI-DSS demonstrates that security is not a promise, but a regularly audited practice.

4. Contractual Agreements

The relationship between your company and Ringover is formalised through a Data Processing Agreement (DPA), in which your company acts as the data controller and Ringover acts as the data processor. Ringover undertakes to maintain appropriate technical and organisational measures and not to reduce the overall security of the service.

How to Choose a Secure Cloud Communications Provider

Before signing with any cloud telephony provider, ask these questions. The answers will reveal its real level of commitment to security:

• Where do you physically host my data? The answer determines which legislation applies to your communications.
• What security certifications do you have? Look for standards such as ISO 27001, HDS, and PCI-DSS.
• How do you encrypt calls and data at rest? Confirm the use of SRTP and TLS.
• What access control and permission tools do you offer? Check that the provider supports MFA and granular permissions.
• How do you help me comply with the GDPR? A serious provider will offer a DPA and a DPO contact.
• What is your migration plan, and how do you secure data during the process? The transition must not create vulnerabilities. To go further, review how to design a secure cloud migration strategy.

A provider that answers these questions transparently gives you the foundation to make an informed decision.

In Summary

Cloud security is a shared responsibility: the provider secures the infrastructure and encryption, while your company manages access, permissions, and internal training. Choosing a provider with a strong, communications-specific security approach and applying best practices within your organisation makes all the difference.

A platform like Ringover, with end-to-end encryption, EU hosting, and audited certifications, allows you to benefit from the cloud without compromising the protection of your data or conversations. Start your free trial today and discover the power of cloud communications for yourself.

Cloud Security Best Practices FAQ

What are the 4 C's of cloud security?

The 4 C’s of cloud security are Cloud, Cluster, Container, and Code. This model is mainly used in cloud-native and Kubernetes environments to show that security must be applied in layers, from the underlying cloud infrastructure to the application code itself [1]. In business communications, the same logic applies: protecting the infrastructure is not enough if user access, applications, devices, and data flows are not also secured.

What are the best practices for cloud security?

The most important cloud security best practices include enabling multifactor authentication, enforcing strong passwords, applying the principle of least privilege, encrypting data in transit and at rest, monitoring for unusual activity, segmenting networks, backing up critical data, and training employees to recognise phishing and social engineering attacks. For cloud telephony and UCaaS, companies should also verify the provider’s encryption protocols, data hosting location, certifications, access controls, and GDPR support.

What is the 3 4 5 rule in cloud computing?

The 3 4 5 rule is not a formal security rule, but a simple way to remember the NIST cloud computing model: 3 service models, 4 deployment models, and 5 essential characteristics [2]. The 3 service models are IaaS, PaaS, and SaaS; the 4 deployment models are private cloud, community cloud, public cloud, and hybrid cloud; and the 5 essential characteristics are on-demand self-service, broad network access, resource pooling, rapid elasticity, and measured service.

What are the 5 4 3 principles of cloud computing?

The 5 4 3 principles of cloud computing refer to the same NIST framework in a different order: 5 essential characteristics, 4 deployment models, and 3 service models [2]. In practice, this means cloud services should offer on-demand access, broad network availability, shared resource pooling, rapid scalability, and measured usage, while being delivered through private, community, public, or hybrid cloud models and structured as SaaS, PaaS, or IaaS.

Citations

• [1]https://csa-website-production.herokuapp.com/artifacts/security-guidance-v5
• [2]https://www.ncsc.gov.uk/collection/cloud/understanding-cloud-services/cloud-security-shared-responsibility-model
• [3]https://www.enisa.europa.eu/publications/cloud-security-guide-for-smes
• [4]https://csrc.nist.gov/pubs/sp/800/58/final
• [5]https://commission.europa.eu/law/law-topic/data-protection_en

Published on July 15, 2026.