If you’ve decided to work with Oki-Toki, you need telephony to communicate with customers. The platform handles queue routing, conversation scripts, dialer, and analytics. However, for the system to receive and make calls, it requires a SIP number.
A SIP number works over the internet and connects to the Oki-Toki cloud as an external line. Without it, automation tools remain just an interface: it’s the communication provider that ensures voice traffic passes from agent to customer.
For effective work in the Polish market, it’s not enough to simply buy any virtual number. It’s important to consider local specifics: the requirements of the UKE regulator, strict compliance with RODO (GDPR) regulations, and the preferences of Polish subscribers.
This article is for informational purposes. Information is collected based on data from providers’ official websites and the experience of Oki-Toki clients. We are not sales representatives of the mentioned companies. Always verify current rates and document requirements directly with the operator.
Before moving on to the list of providers, let’s understand the technical and legal criteria so your call center doesn’t get blocked on the first day of operation.
What’s important to consider when choosing a SIP Provider in Poland
Choosing an operator in Poland is not just about finding the lowest price. It’s choosing infrastructure that determines your “connection rate” and absence of legal problems.
Polish specifics: regulator and technologies
The Polish market is controlled by the UKE regulator (Urząd Komunikacji Elektronicznej). Here are two key factors:
- UKE Registry: A legitimate Polish provider must be listed in the registry of telecommunications entrepreneurs. Working with “grey” intermediaries increases the risk that your traffic will be blocked by backbone operators as suspicious.
- End of the ISDN era: Poland has almost completely transitioned to IP networks. Local infrastructure is modern and optimized for SIP-trunking, ensuring high sound quality and fast signal transmission.
Technical and legal criteria
- Correct Caller ID (CLI): Polish mobile operators actively fight spam. If the provider transmits the number incorrectly, calls will be identified as “suspicious”. Make sure the operator guarantees transmission of your real Polish number in international format.
- RODO (GDPR) Compliance: Poland has strict data protection rules. If the provider stores call recordings or logs, its infrastructure must comply with RODO standards.
- Channel Scalability: Find out in advance how many simultaneous lines are allocated per number “by default” and how quickly capacity can be expanded.
- Technical Support: Local support in the CET/CEST time zone is standard. For call centers operating 24/7, having an on-duty shift is critical.
Choosing a reliable provider is a guarantee that your reports in Oki-Toki will reflect the actual work of agents, not technical failures on the line.
Types of polish numbers: What to choose for a call center
In Poland, the choice of number type directly affects Answer Rate (connection percentage). Subscribers are extremely selective: they often ignore unfamiliar city codes but readily answer mobile numbers.
- Mobile numbers (Numery komórkowe): Start with 45, 5, 6, 7, or 8. Maximum level of trust. Suitable for sales departments and delivery services.
- Geographic numbers (Numery geograficzne): Tied to a city (Warsaw — 22, Krakow — 12). Create the effect of physical presence for local business.
- Toll-free numbers (800): Free for the customer. Ideal for “hotlines” of major brands.
- Info lines (801 and 804): Shared Cost numbers. Allow organizing a single national number for technical support.
Technical nuance of connecting to Oki-Toki
It’s important to understand: Oki-Toki is not the owner of numbers and cannot “arbitrarily” assign any displayed number (Caller ID). Number display entirely depends on what your SIP provider transmits.
In the Oki-Toki interface, connection is implemented in two ways:
- Creating SIP Registration: You enter data (login, password, domain) received from the operator. In the “A-number” field, your real number or login is specified — this is the data the system will transmit in SIP headers.
- Authorization by B-number: Used for incoming line so the system understands which of your numbers received the call and routes it according to the appropriate script.
If you need the customer to see a mobile number displayed — it must be purchased from the provider and connected as a separate SIP registration.
Dialer and GDPR: What you need to know before connecting
In Poland, call automation is an area of heightened attention. Mistakes can lead to fines from UKE and UODO (personal data protection).
- RODO (GDPR) and Consent: You must have prior, express consent (Zgoda) from the subscriber to call. Calls to “cold databases” without consent are prohibited.
- Identification: The system must transmit a real number (Caller ID) so the subscriber can call back.
- Lista robinsonów: This is a registry of people who have opted out of marketing calls. Before uploading a database to Oki-Toki, it must be checked against this list.
What to clarify with the provider in advance
- Tolerance for dialer: Some providers block accounts when automatic dialing is detected.
- CPS limits (Calls Per Second): Clarify the limit of call attempts per second. Oki-Toki’s dialer can generate dozens of requests instantly. With low CPS, calls will be rejected with errors, and the database will “burn out” in vain.
- RODO compliance: Confirm that the operator’s infrastructure complies with data protection standards.
Following these rules protects the business from downtime. Now let’s move on to specific communication providers in the Polish market.
Local polish providers
Datera — provides SIP-Trunk, VIP numbers, geographic and virtual mobile numbers. When requesting SIP traffic, they require a detailed use case description.
EasyCall — connection via login/password (SIP-Client) or by IP (SIP-Trunk). Works with both local and international numbers. Main focus is on B2B solutions and integrations for call centers.
PLFON (Peoplefone Polska) – authorization via login/password or IP, connection of Polish landline and mobile, as well as international numbers. Number porting and integration with CRM systems.
FCN — offers SIP connection, geographic numbers and multi-channel communication. Authorization via login/password or IP. Client verification (KYC) is required.
FONEO — operator from Polish equipment manufacturer Slican. SIP-trunk is implemented as part of VoIP services (PBX connection + multi-channel calls), not as a separate product.
Ipfon — connection with authorization via login/password or IP. Work with Polish geographic numbers, routing of incoming and outgoing calls via IP network.
SuperVoIP — services for connecting SIP-trunk or client registration, custom CLI, porting landline numbers to SIP format, registration (KYC). Suitable for small businesses who need “just a number with SIP registration”.
International providers and aggregators
Freezvon (Telephonic Solutions OÜ) — international VoIP provider, provides Polish virtual numbers linked to SIP account. Allows receiving and making calls through forwarding to SIP, mobile or landline numbers.
DIDWW (DIDWW Ireland Limited) — global provider. Database of Polish mobile and local numbers. Full management via API and scalable number of channels.
Zadarma — international VoIP provider, offers virtual Polish numbers (+48) with SIP connection. Supports SIP registration (login/password), incoming and outgoing communication. Connection is made through personal account without additional infrastructure.
CommPeak — international VoIP provider, provides SIP-trunk and access to Polish destinations. Supports multi-channel calls, local routing within Poland and A-Z VoIP termination for outbound traffic. Suitable for call centers with high call volume and integration with CRM/PBX.
In practice, companies use combined schemes with task division between local and international providers.
- Local operators are connected for working with Polish numbers (+48) and incoming communication;
- International providers are used for outbound traffic or calls “abroad”.
This approach reduces blocking risks and allows maintaining a balance between communication quality and system flexibility.
Telephony is the foundation of call center operations. Its stability determines whether calls reach the customer and whether the agent can work properly. A reliable provider is a guarantee that communication will be without failures, and the business won’t lose inquiries and customers.
