Replacement of a Siedle in-house telephone

From the 50s to the 90s of the last century, the so-called 6+n system was the state of the art in door communication technology. Intercoms of this type have been installed millions of times; many have now reached operating hours that require replacement. This can be done without any complex installation: the Siedle replacement telephone HTA 811 fits seamlessly into an existing system of the 6+n system. With an IQ in-house telephone and the Siedle app, the older systems even have access to mobile door communication.

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Modernisation made easy

Cover up old drill holes or dirt – Siedle’s retrofit panels mean there’s no need for any plastering or painting. They ensure tidy, precision modernisation, both inside and out! Take a look at our video and see just how quick and easy it is.

The Siedle app. For systems from 1952 onwards.

Mobile door communication is possible even with older intercom systems: Just upgrade them with the Siedle IQ in-house telephone and the app. Users can connect to the digital world, regardless of how old their system.

Go to Siedle IQ

From old to something to behold.

The HTA 811 replacement model comes in the same variety of materials and colours as the current Siedle indoor call stations. So replacement provides a visual upgrade as well as a technological one. An electrician will clarify the requirements on site, calculate the work involved and submit a binding offer.

Go to specialist partner near you

Modernisation with the Siedle retrofit panel

The Siedle retrofit panels cover the wall cut-out precisely where old devices leave e.g. colored edges, drill holes or a flush-mounted box that is too large. There is no need for plastering or painting; retrofitting is quick and easy.

To the product

The HTA 811 replacement telephone replaces these old Siedle devices

The HTA 811 replacement telephone replaces an impressive eight generations of older Siedle in-house telephones installed using the 6+n system. This overview shows which ones these are.

Interested in replacing a Siedle in-house telephone? All contact partners at a glance:

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Information for builders

More about us. And about our products.

Siedle door communication is incredibly versatile.

Simple, convenient, smart: the Siedle app

More choice at the entrance: our door stations

You can trust in us

Durable and upgradeable

A Siedle system is a safe investment. After all, we develop our systems to last a long time. And when we develop new products, we focus on backwards-compatibility and updateability.

Quality and investment protection

Easy operation

Siedle products offer features which make life easier and safer for their users. We favour clarity over superfluous and frivolous complications.

Technology for people

Made in Germany

We are a high-tech company that uses the latest production methods. At the same time, it is our human qualities and traditional skills that give our products their very own character.

Made in Germany