I am currently working on a Analog Telephone project and I have some questions. ICs and Central are below;

1. Central: KX-NS500 (Gives 28VDC)
2. DTMF Receiver: MT8870
3. DTMF Generator: HT9200B
4. MCU: STM32WB10CCU5
5. Line Mng. IC: TEA1062AT
6. Power IC: 3V3 Fixed SMPS

Below is my circuit diagram with some details;

2. DTMF Receiver

Here is the DTMF receiver with MT8870 IC. I build the transistor circuits because datasheet says IC's typical Vdd = 5.0V however it works fine with 3V3.

3. DTMF Generator
   

Here is Tone Generator Circuit. It is working in parallel mode.

4. MCU

Here is MCU circuit diagram. Some Keypads and GPIOs.

5. Line (TEA1062AT)!!!

Here are the TEA1062AT & Line Connection. J2 stands for "Hook Switch" and J3 for "Line Input". Here I have some problems. First of all, when I supply all other ICs (Receiver, Generator, MCU) with 3V3 from Power Supply (Isolated from TEA1062AT's Vcc) all of them works fine. I can send and receive DTMF tone. But when I try to supply using TEA1062At VCC pin, (Datasheet says you can use this pin to supply peripherals)current from this pin is not being enough. When I upload empty code to MCU, I have stable 3.32V @VCC from TEA. (VCC_Line Net) but I try to send and receive some datas from MCU to Generator and Receiver, that 3.32V oscillate. I tried to increase current capability by lowerind R114 and by inrceasing R93. It did not work. Then I tried get fixed fixed 3V3 voltage by using circuit below.
I take supply for this circuit from after R87(Voltage drop here is Aprox. 9V). It works. This time I could not get the DTMF tone from TEA1062 Line Pin.

Ok. Any way to supply all peripherals without/with TEA1062AT? How to interface with Central - TEA1062 IC? What is wrong in these circuit?

Thank you.