How is a SIP invite sent?

The telnyx Data API tab describes a SIP request:

Requires IP Authentication to be setup through the portal and associated with LRN under Telephone Data Tab

Send a SIP Invite to llookup.telnyx.com with the number you wish to dip on port 5060

The response will be a SIP 302 redirect for example:

SIP/2.0 302 Moved Temporarily
Via: SIP/2.0/UDP 172.16.1.12;branch=z9hG4bKfae8cb69f547b8cb;received=172.16.0.179
From: <sip:[email protected]>;tag=102
To: <sip:[email protected]>
call-id: [email protected]
CSeq: 1 INVITE
Contact: Transfer <sip:5555555555;=+15555555556;npdi;@174.36.199.131>
Content-Length: 0

If a number has been ported the response will contain the dip indicator ("npdi;") as well as the LRN (=+1..), otherwise these fields will be missing

How, exactly, is the SIP invite sent to telnyx? I created an API token on the telnyx site named sip_invite...but now what?

see also:

https://support.telnyx.com/18144-ip-trunk-configuration/freepbx-ip-auth-trunk-configuration-with-telnyx-mission-control-portal

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