I don't understand what a SIP invite is. Certainly it's explained as: "This article explains the main fields included in a SIP INVITE, which is sent to set-up a VoIP call. A SIP INVITE message contains typically between 4 and 6 header entries with contact information inside them."
http://www.3cx.com/blog/voip-howto/sip-invite-header-fields/ The article enumerates the headers and explains them. But what sends the invite? Asterisk? A soft-phone? I found sample config's to send an invite with Asterisk but no other method was given. Can only Asterisk send an invite? Why? The article says that it's sent "to set-up a VoIP call," so presumably any reasonable soft-phone sends these invites as a normal process. That's all well and good, but how do send an actual invite and get a response? This can only be done through Asterisk? This is in the context of: Requires IP Authentication to be setup through the portal and associated with LRN under Telephone Data <https://portal.telnyx.com/#/app/telephone-data> Tab Send a SIP Invite to *lrnlookup.telnyx.com <http://lrnlookup.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:5555555555@172.16.1.12>;tag=102 To: <sip:5555555555@174.36.199.131> call-id: 0704037283648236478326200101@172.16.1.12 CSeq: 1 INVITE Contact: Transfer <sip:5555555555;*rn=+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 (rn=+1..), otherwise these fields will be missing from https://apidocs.telnyx.com/ and then clicking "Data API" and then "SIP request" for details. I have a running instance of Asterisk. I would have to handle the invite through Asterisk and keep it running to make and receive calls? Presumably this invite is interacting with Asterisk, or something similar, at telnyx.com -- which seems overkill. thanks, Thufir
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