In certain situations, it makes sense not to carry out voice data via the telephone system but via the local company network - directly from telephone to telephone. For example, this can be interesting for customers with a high call volume within their location (e.g. authorities) and in cases where the Internet connection provided for telephony should be kept to a minimum. For cases like these, there is the option of keeping voice data (RTP) directly within the local network (LAN). The setting, which must be adjusted, is CANREINVITE, which NFON can configure for a location and devices are in turn then assigned to this location. Alternatively, it can also be selected directly in the device setting.