[asterisk-users] asterisk 1.8 sends "SIP/2.0 481 Call/Transaction Does Not Exist" to INVITE

[Vik Killa]

Asterisk is sending a 481 in response to an INVITE for reasons I do not
understand. Here is the INVITE:


INVITE sip:8009499014 at X.YYY.32.3:5060;transport=udp SIP/2.0
Record-Route: <sip:X.YYY.32.10;lr=on;ftag=247898>
To: <sip:8009499014 at X.YYY.32.10
:5060>;tag=ac86f72d2bfe10395b2e62e01c70bf66.0f65
From: "Scott Thompson" <sip:7166359474 at X.YYY.32.10>;tag=247898
Via: SIP/2.0/UDP X.YYY.32.10;branch=z9hG4bK542e.5042d534.0
Via: SIP/2.0/UDP
X.YYY.33.178:5060;rport=5060;received=X.YYY.33.178;branch=z9hG4bK57b720cccb00f8498662f48e8
Call-ID: 94f80f866e877490729548a079abe371 at 192.168.101.5
CSeq: 2 INVITE
Contact: <sip:7166359474 at X.YYY.33.178:5060>
Max-Forwards: 69
x-inin-crn: 2001471530;loc=Amherst;ms=STAMPEDE-MS
Supported: join, replaces
User-Agent: ININ-TsServer/3.13.11.12748
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, PRACK, REFER,
SUBSCRIBE
Accept: application/sdp
Accept-Encoding: identity
Content-Type: application/sdp
Content-Length: 252
Proxy-Authorization: Digest
username="909003660716",realm="X.YYY.32.10",nonce="5237559000011a22ed0fae66765d46ef9131e311fbb9d2fb",uri="sip:8009499014 at X.YYY.32.10
:5060",response="cb6306569b3047ac35064dcb5aee6db4"
X-Enswitch-RURI: sip:8009499014 at X.YYY.32.10:5060
X-Enswitch-Source: X.YYY.33.178:5060



The only problem I see with this INVITE is the VIAs are not right after the
INVITE line... although in https://www.ietf.org/rfc/rfc3261.txt, it
explicitly states the the order of the headers is not a requirement, it
seems Asterisk does make it one...

"The relative order of header fields with different field names is not
   significant.  However, it is RECOMMENDED that header fields which are
   needed for proxy processing (Via, Route, Record-Route, Proxy-Require,
   Max-Forwards, and Proxy-Authorization, for example) appear towards
   the top of the message to facilitate rapid parsing.  The relative
   order of header field rows with the same field name is important."
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