Electronic – Control the hardware of an old phone using a Raspberry PI

I have a very old phone (60 years old) and I want to control its part using a Raspberry PI:

• Microphone & speaker from the head set
• The bell
• The dial wheel

I have the electric circuit but don't recognise all of the parts.

My question is now how I can achieve the following using the Raspberry PI:

1. Detect the signal from the dial wheel
2. Ring the bell
3. Use the microphone and the speakerphone from the headset
4. Detect when the headset was liftet from the hook

Additionally I don't understand all parts in the circuit:

e.g. what is this Pulse Icon is with the caption of 100 between 2 and 6

Update

I tried to decipher the circuit in order to be able to use the hardware of this phone. I used blue for the German color codes of my cables and green for the connectors:

^{simulate this circuit – Schematic created using CircuitLab}

On the phone I have the following connectors:

• M1: Microphone (red)
• M2: Microphone (pink)
• T1: Speaker (dark green)
• T2: Speaker (light green)
• a: Phone line?
• b: Phone line?
• E: Phone line?
• W1 + W2 (bridged)
• W3/1: green cable connected n times with red through J when dialled
• 2: red
• 3: blue
• 4: yellow
• 5: white

Update 2:

It sais 300 Ohm – 7000 W – 0.13 Ku Em on the two coils, which are used for the bells.

This is the acutal phone on the inside.