Dear,
Good Day.
The trace result shows that The 480 arrives to the node, and it is rejected
(dropped) because there is a fault in the message. The following is seen in the
communication buffer of the TEST SYSTEM trace we receive yesterday.
SIP/2.0 480 Temporarily Unavailable
Via: SIP/2.0/UDP
BC00.RAHBC1.MSS.ALMADAR.NET:5060;branch=z9hG4bK00000036926780904874;received=10.150.22.1
Allow: ACK,BYE,CANCEL,INFO,INVITE,MESSAGE,NOTIFY,OPTIONS,PING,REFER,UPDATE
Call-ID:
{acx8285710251vwbcghefemdm...@bc00.rahbc1.mss.almadar.net<mailto:%7bacx8285710251vwbcghefemdm...@bc00.rahbc1.mss.almadar.net>
Contact: <sip:any@10.251.210.3:5060>
Content-Type: application/sdp
CSeq: 116019009 INVITE
From:
<sip:+218912120...@bc00.rahbc1.mss.almadar.net;user=phone>;tag=13000730723785
Record-Route: <sip:BC00.RAHBC1.MSS.ALMADAR.NET:5060;transport=UDP;lr>
To: <sip:150@10.251.210.3;user=phone>;tag=1543136248.891036.906647130
User-Agent: swengine v3.5 r16205
Content-Length: 0
While content-type header is present, the content-length is zero, what is not
acceptable. You can see the explanation below from SIP OPM before, but I copy
here again
For application/sdp type of body RFC 4566 is applicable, which specifies
mandatory and optional parts of the body.
In other words, application/sdp body itself is not expected to be empty."
Upto 16A (GSM_MSC SW), our software was allowing this message, but from 17A
onward, the software has been updated to adapt 100% to the standard.
Here I also attached the Network Impact Report of 16A to 17A. In page number
46, this impact on SIP request/response messages are mentioned.
* MSC-S releases call if SIP request/response is received with
following combination
of elements (not according to syntax rules):
- A message body part (e.g. SDP) is received, Content-Type header indicating
the body part presence is received and Content-Length header received
indicates zero (0) length of the body part,
- No message body part is received but the Content-Type header indicating
the body part presence is received.
Im asking if we can change the 480,486 messages and remove content-type header
or not??
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