Working with a vendor to implement SHAKEN. Can anyone confirm if this call path will work?
PBX ==Invite==>In-line Proxy
In-line Proxy =======Invite=======> Vendor (adds SHAKEN token to header)
In-line Proxy <====403 Forbiden==== Vendor
PBX <=====404 No Route Found======== In-ine Proxy
PBX =============Invite (with new header intact) ===============> SIP Provider
The specific questions I have are:
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With the In-line proxy as the first trunk in the outbound route list, will FreePBX try the next trunk (provider) in the list when it receives a 404 No Route Found or will it just die?
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If it does try the next trunk in the outbound route list, will the invite contain the additional header content from the Shaken Vendor intact?