The problem of sending text messages and making phone calls by VoIP.

In order to meet your requirements, I suggest you use the Easy Talk phone.

Easy Talk mobile phone adopts dual card dual standby, and one card uses your usual number. The other card uses a dedicated VoIP phone number.

In this case, when you make a call, you can use the Easy Talk network number, and when you answer the phone, both numbers are free.

If the other party also uses easy-to-chat products, whether it is software, landline or mobile phone, calls between easy-to-chat products are free. Because it is based on the network form.

As for texting, of course there is no problem.