This is our old Q&A Site. Please post any new questions and answers at

I figured I'd make a shout-out request here since I haven't been able to find a good source of packet capture files for 3GPP call flows, particularly for EPS. I want them as a supplement to a video series I'm putting together on the EPC, and since I plan to make the series public domain I'm restricted from using all the NDA-protected captures I would normally have access to. Example call flows that would be great to have (which I really, really don't want to packet-craft myself) loosely in order of priority. I would appreciate any of these:

  • Normal EPS Attach Procedure (not picky on any optional components of this call flow). Unciphered NAS if at all possible.
  • S11 or S5 interface capture, preferably showing at least one example of a non-128 response code.
  • An SGs interface trace of an incoming CSFB call. Doesn't need to include the S1AP/NAS component but would be great if it did. I'd also take MO since beggers can't be choosers. :)
  • Any Gx or Gy call flow captures, preferably one that illustrates use of MSCC's with a full RSU/GSU/USU flow. Any non-2xxx result code scenario would be good as well.
  • Any example of two legs of a Diameter-routed packet.
  • An SS7 transaction traced over a Sigtran link, preferably one that demonstrates GT translation (I have a few videos that cover historical voice). Could potentially use direct ISUP call with routing on just DPC as well. Not picky on Sigtran flavour.
  • An SMS sent or received over deciphered NAS.
  • Any EMM procedures (periodic update, page, etc.). A page triggered by PDN request visible in trace would be great as well.
  • Any handover procedure. Full X2 would be great, as would any inter-SGw or inter-MME flow.

So, that's my wish list. Just keep in mind that they would need to be free to redistribute to the public domain, which is the deal-breaker for all my existing sources of these kinds of captures.


asked 15 Sep '13, 08:59

Quadratic's gravatar image

accept rate: 13%

edited 15 Sep '13, 09:07

Be the first one to answer this question!
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here



Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text]( "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:


question asked: 15 Sep '13, 08:59

question was seen: 3,506 times

last updated: 15 Sep '13, 09:07

p​o​w​e​r​e​d by O​S​Q​A