DeutschlandLAN SIP Trunk: Telekom’s IP Connection Explained
Trusted Advisor for IT & Telecommunications Sourcing
DeutschlandLAN SIP Trunk: From ISDN Successor to CompanyFlex
IP-Based Telephony Instead of ISDN
The successor to DeutschlandLAN SIP Trunk is called CompanyFlex
With DeutschlandLAN SIP Trunk, Telekom offers an IP-based system connection for medium-sized and large companies. The solution replaces traditional ISDN connections and brings more flexibility, transparency and performance to corporate communications.
In a nutshell:
- Flexible scaling: parallel calls can be added or removed as required
- Cost transparency: choice between flat rates or minute budgets for full cost control
- Technical advantages: HD voice quality fixed IP address and prioritized voice transmission
- Simple administration: all services can be conveniently administered online
- Reliability: Guaranteed fault clearance within a maximum of eight hours
The solution: The former DeutschlandLAN SIP Trunk, now CompanyFlex, replaces the classic ISDN system connection with an IP-based connection offering a flexible channel count and HD voice quality.
What this post covers: How the IP connection works, which features and costs are involved, and what to look out for with the successor product CompanyFlex.
The question: Is your telephone system ready for the switch to IP-based communication?
What is DeutschlandLAN SIP Trunk?
With DeutschlandLAN SIP Trunk, Deutsche Telekom now also wants to offer an IP-based system connection. Alternative solutions are being used more and more, not least due to the impending ISDN shutdown. In addition to ALL IP and VoIP, SIP Trunk is also a good alternative to the previous ISDN system connection. Deutsche Telekom now also offers a digital telecommunications system for medium-sized and large companies. DeutschlandLAN SIP Trunk is the new IP-based connection.
Note: Deutsche Telekom has since replaced DeutschlandLAN SIP Trunk with its successor product, CompanyFlex (SIP Trunk). Existing customers have been migrated, and new customers today order CompanyFlex; the underlying function as an IP-based system connection remains the same.
Features of DeutschlandLAN SIP Trunk
Even in the basic package, corporate customers receive flat rates for landline calls within Germany and to 18 other countries. An Internet flat rate and two parallel calls included! This allows companies to flexibly adapt their requirements. The features include:
- Add or cancel any number of parallel calls
- Extend bandwidth if required
- Cost transparency through flat rates or minute budgets
- Easily manage all services online
- HD voice quality and prioritized voice transmission
- Fixed IP address
- Guaranteed fault clearance within max. 8 hours
Costs of DeutschlandLAN SIP Trunk
The costs of the Telekom IP connection are tailored to your needs. You can find an overview of the two products with additional options here: Options SIP Trunk SIP Trunk Pooling 2 parallel calls incl. Business Flat Premium 54.95 € – 2 parallel calls incl. basic rate – 44.95 € Upgrade bandwidth asymmetric 50MBit/s 4.95 € 4.95 € Upgrade bandwidth asymmetric 100MBit/s 7.95 € 7.95 € Additional parallel calls incl. Business Flat Premium, (1- 28 ) Business Flat Premium, (1- 28 ) € 9.95 – € 12.95 – Additional parallel calls Pooling incl. basic rate (1 – 162) – € 4.25 – € 7.95 Internet access with flat rate/up to 16 Mbit/ fixed IP address included included included
Note: These prices are from the original article and no longer reflect Telekom’s current CompanyFlex price list. We determine current conditions as part of a no-obligation consultation.
How SAVECALL Supports You
As a carrier-neutral sourcing partner, SAVECALL compares SIP trunk and CompanyFlex offers from different providers, checks conditions through the procurement pool, and supports selection, migration and number porting.
Conclusion
With its product, Telekom offers a good all-round solution for both smaller and larger companies. The only drawback for companies is that the connection line is currently only asymmetrical. If you need a symmetrical line, you should test the availability of other providers. Last but not least, depending on the location of your company, you can often get even better conditions than DeutschlandLAN SIP Trunk offers. Use our online check to check availability with a price overview without obligation:
Written by
Frank Frommknecht
Key Account Consultant, SAVECALL
Has supported companies for over 20 years in selecting and optimizing their networking solutions. His focus: making complex telecommunications understandable from the customer’s perspective and finding the right strategic solution.
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Frequently Asked Questions
Frequently Asked Questions about DeutschlandLAN SIP Trunk
DeutschlandLAN SIP Trunk was Deutsche Telekom’s IP-based system connection for medium-sized and large companies, replacing classic ISDN connections with a connection over the internet. It gave companies more flexibility in the number of parallel calls, HD voice quality and a fixed IP address. Telekom has since technically evolved the product and continued it under the name CompanyFlex (SIP Trunk); the underlying function as an IP-based connection has stayed the same.
DeutschlandLAN SIP Trunk is no longer actively sold by Deutsche Telekom. New customers today order CompanyFlex (SIP Trunk), and existing customers have been or are being migrated step by step through a product switch. Existing hardware can usually still be used, though a software update is sometimes required. SAVECALL helps assess whether a switch is due and what conditions are currently achievable on the market.
ISDN uses fixed physical lines with a set number of channels, such as S0 with 2 or S2M with 30 channels. A SIP trunk, by contrast, runs entirely over the existing internet line, scales flexibly in channel count, and supports modern features such as HD voice, video calls and integration with cloud services. This lets companies adjust capacity to actual demand quickly, without laying new lines.
Actual costs depend on the number of channels, the tariff model, and any booked add-ons such as bandwidth upgrades. Historically, basic packages for two parallel calls were priced in the mid-double-digit euro range per month, plus options for additional channels. Since price lists and product names have changed with the switch to CompanyFlex, we recommend a current, no-obligation cost check rather than relying on historical pricing.
In most cases, yes. Many telephone systems are already SIP-capable or can be connected via a session border controller, so a complete replacement usually isn’t necessary. When switching to CompanyFlex, we check whether existing hardware can still be used or only needs a software update. A new, SIP-compatible system is only required in exceptional cases.
As a carrier-neutral sourcing partner, SAVECALL compares SIP trunk offers from various providers, including Deutsche Telekom with CompanyFlex, Vodafone, Colt and further providers from its own partner network. Through the procurement pool, conditions below list price are negotiated, and SAVECALL also supports number porting, contract management and the technical switch-over, so companies can make the change without downtime.
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