How to send a sip messages using domain name

Hi,

I am able to send sip messages using ip address or machine name but instead
i need to send sip message based on FQDN (Fully Qualified Domain Name) like
[email protected] instead of [email protected].

I am using nist-sip api to send subscribe sip messages. I really appreciate
if anyone has any thoughts or solution on how to send sip messages using
domain name instead of particular ip address.

Thanks
Sunil.

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