i have a modem to match with my computer! it's a french "olitec speedcom 56000" but with a blue shell and a Wanadoo branding! Wanadoo was the internet service of France Télécom before it became Orange.

It's a "no screw" design, the back panel slides out and reveal the speaker and 2 pcbs connected to each others by a connector and rivets (??)

i managed to identify these chips inside:
- RCVDL56ACFW/SP modem
- LBA120 dual relay
- CY7C1009 1 MB SRAM
- AM29F002BT-90JC 2 MB flash memory
- MC74HCT08A quad AND gate
- MC74HCT157AD quad 2 input multiplexer

@maya
I had the olitec version back in the day.
It has all leds active and the push button to record unavailable message.
The two jacks on the back (not installed in your version) was to connect a microphone and speakers to use the modem as a "regular" phone.
😉