Questions about W73P cordless telephone

You can contact the brand's support team via the following link: https://www.yealink.com/fr/contact-us

Yes, the base station is included with the Yealink W73P system. The system consists of a base station and can be expanded up to 10 handsets.

No, not in my opinion.
If you want this type of function, you need to use a telephone exchange (Asterisk, 3CX, etc.).

1. swisscom router
log in
Read out sip data
2. Log into yealink
Update firmware
Then enter the read sip data into yealink.
Works fine, top
Reception

With the wireless telephones, the power supply units are always included. The desk telephones are usually located in offices and can be operated there via Power-over-Ethernet. That is why the power supply unit is listed under accessories.

No. It is a DECT phone for use with a suitable base station and not intended for use on a PC. I would use a 935 Jabra for this. It has the same transmission technology and range plus the matching adapter for USB.

You should be able to connect suitable headsets via the free 3.5 mm jack socket.