In recent times, mobile phones have they restricted the use of traditional landline (analog and ISDN) telephones with fixed installation, and even VoIP telephones using the Internet protocol, but their right to exist cannot be questioned to this day. While an office building is unthinkable without a traditional phone number, in terms of costs, VoIP telephony offers everyone a cheaper alternative compared to the costs of mobile calls.
But why would every tenant or owner need their own phone subscription?
In fact, there is no need for it, so you can save a significant part of the monthly subscription fees. A home telephone exchange that distributes incoming calls can help with this.
The question immediately arises, can they only call me if they know my extension number?
No, there is no need for that. Several solutions are possible, each tenant or resident can have their own phone number, or even several that can be called directly. At the same time, conversation rates are significantly lower than usual, even for long-distance and international calls. Conversations within the building and system can be completely free. From the point of view of the definition within the system, it is important that in the case of other locations accessible via the Internet (e.g. a site) it is possible to integrate the phones there into the system as local subscribers. According to another solution, which actually has its right to exist in an office building, the u.n. selection of the called party in the menu system. For many tenants, this can be lengthy, so typically the former solution can be more effective.
At the same time, it is possible to integrate door phones into the system, either from several entry points, gates, or even video door phones, only devices suitable for video calling are required. Of course, it is possible to make video calls inside the building, even as outgoing calls. Of course, the latter requires a service provider whose network allows it, and the called party's device and service provider must also be able to use the service.
In addition, it is possible to have a conference call, record the conversation, leave a voice message, and even forward it as an e-mail. In the case of office buildings, it is possible to set office hours when calls are received directly, while calls are forwarded to a specified number, or messages can be left on a voice recorder.
All of this can work on the building's existing IT network (if it already exists).