Sending SMSes with VOIP.ms is possible, but this requires some special configuration. It's much simpler to instead use twilio.
This is an example with VOIP.ms, a good quality provider.
Create an account. Get a DID number. Fund the account. This is all outside of the scope of this article.
Create a sub account to send the text messages from.
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Here, it's a good idea to limit the IP addresses that you're able to send from to your IP address. Also, this is a SIP connection that is being constructed. Some firewall rules may be required for this to work for you.