SIP.TG

What SIP.TG does

SIP.TG is a Lithuanian communications platform that bridges traditional SIP telephony with the Telegram messenger. Founded in 2019 and operated by the private limited company MB "Žinučių linija" out of Vilnius, the company offers two core products: Gateway, which connects a Telegram account to a PBX to receive and make voice calls, and Softphone, which turns Telegram into a SIP client for any PBX or IP telecom provider. The platform is built on a SIP-to-Telegram voice conversion architecture using the TDLib library for Telegram session management and a Yate-based SIP stack, with audio processed in real time via distributed Worker servers deployed across multiple global data centers; optional self-hosted Worker and Session Storage Docker modules let enterprise customers retain full control over voice streams and account credentials. Out-of-the-box compatibility is offered with Asterisk, 3CX, FreeSWITCH, Oktell, Yate, and Panasonic PBX systems, with TLS/SRTP encryption, configurable caller ID and number transformation rules, DTMF support, and CRM integration via the connected PBX.

The business runs a product-led growth model centered on a Telegram bot (@siptg_bot) that handles onboarding, configuration, and subscription management. Revenue is recurring subscription-based priced in euros per SIP account or line: Softphone from 3 EUR/month (5 EUR/month with recording), Gateway from 15 EUR/month per line plus 15 EUR/month for the main Telegram account, with 150 EUR/month surcharges for large teams and 150 EUR/month for API access at smaller scales; a free tier (1 line, 1 SIP account, 30 minutes/month) drives top-of-funnel adoption. Multi-year prepay discounts (12-month 10%, 36-month 30%) and an enterprise "Softphone for Provider" tier target telecom operators. Distribution combines self-serve bot onboarding, comprehensive documentation, a public Telegram community, and a Solutions Catalog of PBX integrators, VoIP providers, and CRM specialists (Bitrix24, amoCRM) for turn-key deployments. The project was developed by a winner of the Telegram competition for improving voice call infrastructure. The company is privately held with no disclosed funding, 1-10 employees, GDPR/CCPA compliance, and VAT payer status obtained July 9, 2025.

Name

SIP.TG

Legal name

MB "Žinučių linieta"

Website

https://sip.tg

Company type

Private

Founded year

2019

Operating status

Operating

Headcount range

1–10 employees

Short description

SIP.TG is a Lithuanian communications platform that bridges SIP telephony and Telegram voice calls via Gateway and Softphone products, serving SMB sales and support teams, call centers, and IP telecom providers through euro-denominated subscriptions with self-serve onboarding and partner-led enterprise deployment.

Ownership category

akta.pro rank

Product category

VoIP / Telephony Software

NAICS

All Other Telecommunications (517810), Telecommunications (517), All Other Telecommunications (5178)

SIC

Services-Telephone Interconnect Systems (7385), Communications Services, Nec (4899)

akta.pro primary industry

SIP Trunking & Voice Termination (HDAIAHAC)

Keywords

• Sip telephony gateway
• Telegram voip integration
• Pbx softphone software
• Voip api platform
• Cloud telephony bridge

Headquarters

HQ city

Vilnius

HQ country

Lithuania

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Technology or R&D, Infrastructure, Personnel, Marketing or Sales, Operations

Revenue model

1. Softphone Subscription: Subscription-based revenue model for using Telegram as a SIP client. Users pay per SIP account (3 EUR/month without recording, 5 EUR/month with recording), with surcharges for large teams (150 EUR/month for >10 accounts) and API access (free for >10 accounts, else 150 EUR/month). Supports 6-month, 12-month (10% discount), and 36-month (30% discount) payment periods.
2. Gateway Subscription: Subscription-based revenue for connecting Telegram accounts to PBX. Pricing includes 15 EUR/month per line, 15 EUR/month for main Telegram account, 150 EUR/month per additional session, 150 EUR/month surcharge for >5 lines, and 150 EUR/month for API access (free if >5 lines).
3. Softphone for Provider: Subscription model allowing IP telecom providers to offer SIP.TG Softphone to their customers. Cost available upon request; targeted at telecom providers wanting to integrate SIP settings assignment through subscriber cabinets.
4. Free Subscription: Free tier providing basic functionality for testing with limitations: 1 line in Gateway, 1 SIP account for Softphone, 30 minutes total call duration per month, 2-minute max call duration, 10 unsuccessful calls per hour. Serves as lead generation for paid upgrades.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

SIP.TG is a VoIP bridge platform that connects SIP telephony with Telegram voice calls. It enables businesses to use Telegram as a SIP softphone (Softphone) or to connect a company Telegram account to a PBX for inbound and outbound voice calls (Gateway), with optional self-hosted Worker and Storage modules for low latency and confidentiality.

Product overview

SIP.TG is a VoIP bridge platform that connects SIP telephony with Telegram, consisting of two core products: Gateway (for connecting Telegram accounts to PBX systems) and Softphone (for using Telegram as a SIP client). The platform offers optional self-hosted Worker and Storage modules for enterprise deployments requiring enhanced privacy and performance. Subscription tiers include Free, Softphone (from 3 EUR/month), Gateway (from 30 EUR/month), and Softphone for Provider (enterprise). A REST API enables process automation for larger deployments. The platform integrates with major PBX systems (Asterisk, 3CX, FreeSWITCH, Oktell, Yate, Panasonic) and supports CRM integration through the connected PBX.

Differentiator

Problem solved

Functional benefit

Products and services

• Gateway Connects a Telegram account to a PBX system, enabling receiving and making voice calls through the company's Telegram account. Supports multi-channel calls, flexible Caller ID settings, routing to support or sales teams via PBX, and CRM integration.
• Softphone Enables Telegram to function as a SIP client for any PBX or IP telecom provider. Allows connecting to VoIP providers or office PBX using SIP credentials with incoming and outgoing calls forwarded through Telegram, call recording, codec configuration, and assigning SIP accounts to other Telegram users.
• Worker Module Self-hosted Docker container server module that processes and converts voice data between SIP and Telegram. Deployed on own server with dedicated IP, providing performance guarantee, minimal delay by proximity to PBX, voice stream confidentiality, and access to private networks.
• Session Storage Module Self-hosted server module that stores keys and access data for Telegram accounts, providing full control over the confidentiality of Telegram account access, unlimited number of accounts per storage, and flexible configuration for restricting commands and events.
• Softphone Subscription Paid subscription that removes restrictions on using Telegram as a SIP client. Includes unlimited SIP accounts (each paid separately), call recording to Telegram chats/channels, assigning SIP accounts to other users, and API access.
• Gateway Subscription Paid subscription that removes restrictions on connecting a Telegram account to a SIP PBX. Includes multi-channel voice calls through a Telegram account, unlimited call duration, and connection of additional Telegram accounts.
• Softphone for Provider Subscription Allows IP telecom providers to offer SIP.TG Softphone as a SIP client to their customers and integrates SIP settings assignment to Telegram users through the subscriber's cabinet via API.
• SIP.TG REST API REST API for process automation, available free to users with more than 10 Softphone accounts or 5 Gateway lines, otherwise 150 EUR/month. Enables automation of SIP account management and integration with external systems.

Quantifiable outcome

• Worker performance: 1 call uses approximately 2.5% CPU on AMD Ryzen 5 1400 core with ~1 MB RAM using G.711 codec

Segments4 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration12 records

AI capability3 records

Feature9 records

Partnerships

Seven partnerships are on record, tiered core and minor.

• PBX Developers and Integrators DirectorycoreImplementation/ SI/ Consulting PartnerGlobal directory of PBX developers, integrators, and VoIP providers who can implement SIP.TG turn-key, help with payments, and provide financial documentation. Tagged categories include Partner, Integrator, Payments, PBX, Telecom, Bitrix24, amoCRM specialists.
• Payment PartnerscoreChannel Partner/ Reseller/ DistributorPartners helping with SIP.TG service payments, including monthly/quarterly payment flexibility and financial document preparation. Located in various countries.
• SIP.TG Compatible PBX Systems (Asterisk, 3CX, FreeSWITCH, Oktell, Yate, Panasonic)coreTechnology or IntegrationOut-of-the-box support for Asterisk, 3CX, FreeSWITCH, Oktell, Yate, Panasonic PBX systems. Standard SIP protocol integration.
• Stripe Payments EuropecoreOthersPayment service provider for processing credit card payments through Telegram's built-in payment tools or third-party provider.
• PayPalcoreOthersPayment service enabling users to make online payments for SIP.TG subscriptions.
• NOWPaymentsminorOthersCryptocurrency payment service supporting BTC, ETH, USDT, TON and other cryptocurrencies.
• Smart GlocalminorOthersPayment service allowing users to make online payments for SIP.TG services.

Scale indicators2 records

Recent moves6 records

Expansion highlights6 records

Others

• Telegram: Telegram is the platform SIP.TG is built on. Not a direct competitor today, but represents both the largest distribution channel and the single largest platform-risk exposure for SIP.TG.
• Asterisk (open source PBX): SIP.TG integrates out-of-the-box with Asterisk. Asterisk itself is adjacent infrastructure rather than a competitor, but its broad installed base defines SIP.TG's primary integration ecosystem.

Broad incumbents

• Telnyx: Telnyx offers SIP trunking, voice APIs, and private global IP networks. Comparable as a SIP trunking incumbent with overlapping enterprise telephony use cases.
• Sinch: Sinch provides cloud communications and SIP trunking globally, including voice and messaging APIs. Overlaps with SIP.TG's broader SIP-to-channel gateway value proposition.
• Twilio: Twilio's Voice/SIP trunking products (Elastic SIP Trunking, Voice API) overlap with SIP.TG's SIP-to-channel gateway functionality at much larger scale, though without the Telegram-specific bridge.
• Vonage (Ericsson): Vonage offers UCaaS and SIP trunking for enterprises. Comparable as a broader incumbent whose SIP trunking capabilities overlap with SIP.TG's enterprise gateway use cases.

Direct peers

• Zoiper: Zoiper is a widely used SIP softphone for desktop and mobile. It is directly comparable to SIP.TG Softphone as an end-user SIP client, though it does not bridge into Telegram.
• Linphone: Open-source SIP softphone (Belledonne Communications) that competes at the SIP-client layer with SIP.TG Softphone, particularly for users wanting full-featured SIP telephony without a managed service.
• Acrobits: Acrobits (Groundwire/SIPwise) provides white-label SIP softphones and VoIP platforms. Highly comparable as a SIP softphone and SDK provider used by service providers to deliver telephony apps.
• Bria (CounterPath / Sangoma): Bria is a commercial SIP softphone widely deployed by service providers and enterprises. Direct substitute for SIP.TG Softphone in enterprise voice deployments.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• GitHubgithub.com/siptg/worker

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about SIP.TG