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SIP response codes

SIP 199 Early Dialog Terminated

An early dialog was terminated (forking). The request is being processed; more responses will follow.

199

Name: Early Dialog Terminated
Class: 1xx · Provisional
Defined in: RFC 6228

The request is being processed; more responses will follow.

What the response looks like

SIP/2.0 199 Early Dialog Terminated
Via: SIP/2.0/UDP 203.0.113.10:5060;branch=z9hG4bK776asdhds
From: <sip:101@pbx.example>;tag=1928301774
To: <sip:+15551234567@pbx.example>
Call-ID: a84b4c76e66710@203.0.113.10
CSeq: 2 INVITE
Content-Length: 0