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Bug #6145

closed

osmo-bts-trx: verify correctness of the CSD rate adaptation

Added by fixeria 4 months ago. Updated about 2 months ago.

Status:
Resolved
Priority:
Normal
Assignee:
Category:
-
Target version:
-
Start date:
08/24/2023
Due date:
% Done:

0%

Spec Reference:
Tags:
CSD

Description

Hi Harald,

laforge wrote in #1572#note-39:

The best way to do this validation would be to set up a CSD call between two MS and take a pcap file of the V.110 data in RTP CLEARMODE. I do have existing V.110 code for decoding such captures, which I validated against ISDN equipment doing V.110. So if the same tools can decode the V.110 in RTP clearmode, we can be satisfied with it.

I was able to establish a transparent data call between two Calypso-based phones (SE K200). Once the call was established (CONNECT 9600), I typed a few words in the calling terminal and a few words in the called terminal. Please find the full PCAP attached, which includes the logging, LAPDm, RSL, etc. and most importantly the RTP frames with the V.110 frames. Let me know if I missed something. Thanks!


Files


Related issues

Related to OsmoBTS - Feature #1572: Circuit Switched Data (CSD) Support in osmo-btsResolvedfixeria02/23/2016

Actions
Actions #2

Updated by fixeria 4 months ago

  • Related to Feature #1572: Circuit Switched Data (CSD) Support in osmo-bts added
Actions #3

Updated by fixeria 4 months ago

Attaching another PCAP file with a chunk of the GPL license text.

Actions #4

Updated by fixeria 3 months ago

  • Tags set to CSD
Actions #5

Updated by laforge about 2 months ago

  • Status changed from New to Feedback
  • Assignee changed from laforge to manawyrm

sorry for not finding time to do this. I guess given that manawyrm has meanwhile successfully tested several CSD variants, this can be closed?

Actions #6

Updated by manawyrm about 2 months ago

I was able to successfully decode a 9600baud RLP/NT CSD call on the ISDN side, yes.
Fax as well, so it must be pretty OK. No idea about slower baudrates, though.

Actions #7

Updated by laforge about 2 months ago

  • Status changed from Feedback to Resolved

let's mark this as resolved then. we can create issues if we find actual issues.

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