Thanks Thanks:  3
Showing results 1 to 10 of 10

Thread: Qualcomm NV documentation (specifically, 'qp_ims_reg_config_db')?

  1. #1
    Junior Member Reputation: 10
    Join Date
    2020-09-05
    Posts
    5


    Question Qualcomm NV documentation (specifically, 'qp_ims_reg_config_db')?

    Many Qualcomm modem NV items are self-documenting, but just as many are not. Is there any documentation that exists for any of the non-obvious ones?

    Right now, I'm specifically looking for NV 71527 (ims/qp_ims_reg_config_db). Each ims_rat_apn_info[#] struct member seems to be a bitfield of some sort, but I have no idea what the valid values are.

    I managed to find a brief high-level description of the purpose of the NV over here: https://www.it619.net/index.php?doc-view-2687.html

    ...however, it does not explain what the valid values are, other than giving one example (apparently iRAT == 16 matches against a RAT of LTE, so I assume this means bit 5 of iRAT means "LTE"; what do the other bits mean?).

    It also does not explain how each ims_rat_apn_info array element maps to a particular data profile/PDN. There are 10 possible entries (0-9), and from what I've seen, usually the 0 and 9 ones are at least populated. Why #9?

    Thanks for any leads, hints, or docs, official or unofficial!!

  2. # ADS
    Circuit advertisement
    Join Date
    Always
    Posts
    Many
     

  3. #2
    Senior Member Reputation: 1496
    Join Date
    2007-10-24
    Location
    Nauru
    Posts
    446


    Default Re: Qualcomm NV documentation (specifically, 'qp_ims_reg_config_db')?

    I dont quite understand what it is about,
    but try to find the pdf
    80-NL507-1 IMS Policy Manager NV Settings Overview

    maybe you will find this document on xda,
    it has a topic with leaked documentation,
    but I couldn't download it.
    so can't confirm.

    I also recommend QDART, I haven't seen new versions for a long time.
    but your NV starting using before 2014.

    I don't offer any PDF or EXE. just wrote my thoughts.
    /carv

  4. Thanks NathanA thanked for this post
  5. #3
    Junior Member Reputation: 10
    Join Date
    2020-09-05
    Posts
    5


    Default Re: Qualcomm NV documentation (specifically, 'qp_ims_reg_config_db')?

    Quote Originally Posted by carver View Post
    try to find the pdf
    80-NL507-1 IMS Policy Manager NV Settings Overview

    maybe you will find this document on xda,
    it has a topic with leaked documentation,
    but I couldn't download it.
    so can't confirm.
    Thanks for the lead! Unfortunately, "80-NL507-1", "NL507", and "IMS Policy Manager" return no results when searching XDA, and in Google return no useful results. So it's good to know that this document exists, but I cannot find it referenced anywhere!

    Did you actually see an XDA post where it was referenced? If so, can you link to it?

    Many thanks again!

    EDIT: I think I may have found the XDA thread you refer to...1856327? I also cannot access it, which is strange since I am a senior member over there with 8-year-old account. Maybe it was blocked for legal reasons.
    Last edited by NathanA; 2020-09-07 at 08:36 AM

  6. #4
    Member Reputation: 224 macro's Avatar
    Join Date
    2019-04-04
    Location
    War
    Posts
    281


    Default Re: Qualcomm NV documentation (specifically, 'qp_ims_reg_config_db')?

    nv_complete.zip
    Hope, it is help you in your search

  7. #5
    Senior Member Reputation: 1496
    Join Date
    2007-10-24
    Location
    Nauru
    Posts
    446


    Default Re: Qualcomm NV documentation (specifically, 'qp_ims_reg_config_db')?

    Quote Originally Posted by macro View Post
    nv_complete.zip
    Hope, it is help you in your search
    oh, it's just a file from an old QXDM (in notes written that from 2012).
    and these files don't describe the nv items structure.

    maybe this file from QXDM_v3.

    at my laptop it stored:
    C:\Users\All Users\Documents\Qualcomm\QXDM\Vendor\Qualcomm\
    01.06.17│790653│RA │NVItem.txt
    C:\Users\Public\Documents\Qualcomm\QXDM\Vendor\Qualcomm\
    01.06.17│790653│RA │NVItem.txt
    Last edited by carver; 2020-09-12 at 04:39 AM
    /carv

  8. #6
    Member Reputation: 224 macro's Avatar
    Join Date
    2019-04-04
    Location
    War
    Posts
    281


    2 out of 2 members found this post helpful.

    Default Re: Qualcomm NV documentation (specifically, 'qp_ims_reg_config_db')?

    Sory, only tried to help, search and find this file on XDA forum, also there is link on it inside the file

  9. Thanks carver thanked for this post
  10. #7
    Senior Member Reputation: 1496
    Join Date
    2007-10-24
    Location
    Nauru
    Posts
    446


    1 out of 1 members found this post helpful.

    Default Re: Qualcomm NV documentation (specifically, 'qp_ims_reg_config_db')?

    I apologize too.

    i just use NVItem.txt for many years,
    when I need to see nv_item's in modem.

    manufacturer nv_items will be without names ))
    /carv

  11. #8
    Junior Member Reputation: 10
    Join Date
    2020-09-05
    Posts
    5


    Default Re: Qualcomm NV documentation (specifically, 'qp_ims_reg_config_db')?

    QXDM does not seem to know the structure of these particular items. For some items where it understands available options, it will give you a drop down menu to pick fro, but not for these. I think the only way that we will be able to gain knowledge of the meaning of the bitfields is through external documentation.

    I did recently discover that for iRAT value, 256 (bit 9) is IWLAN. Previous web site I linked to explained 16 (bit 5) is LTE. So decimal 272 matches against both LTE and IWLAN (for Wi-Fi Calling / ePDG).

    I have seen iRAT set in some phones with other bits flipped on. I am guessing that remaining bits must stand for certain kinds of 3G networks (UMTS, 1xEVDO, etc.)?

    Still completely unclear what the various other values mean, and what each array index is mapped to. I can make IMS registration work over both LTE and Wi-Fi by only configuring ims_rat_apn_info[0]. So what are the others for? And is there something special about the last one, [9]? Maybe reserved for emergency services?

  12. #9
    Senior Member Reputation: 1496
    Join Date
    2007-10-24
    Location
    Nauru
    Posts
    446


    Default Re: Qualcomm NV documentation (specifically, 'qp_ims_reg_config_db')?

    i cleared the qcom watermark and sent you the document link in PM.

    yes, qualcomm prohibits the distribution of these documents,
    and sometimes sends abuse warnings to hoster.

    WeChat Screenshot_20200915194839.jpg
    /carv

  13. Thanks NathanA thanked for this post
  14. #10
    Junior Member Reputation: 10
    Join Date
    2020-09-05
    Posts
    5


    Default Re: Qualcomm NV documentation (specifically, 'qp_ims_reg_config_db')?

    Wow, amazing, thank you!!

    Document looks like it was rushed to publication, and is not comprehensive / is missing some information (e.g., does not discuss possible values for iAllowedIMSSrvOnWLAN, does not explain usage of bit 5 for iIPTypeInfo, & many others) and contains several typos, but is still very helpful. With this + some trial and error, I think I will finally be able to make MMS APN bearer come up over ePDG connection as well!

Bookmarks

Bookmarks

Posting Rules

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •