CS Fallback in NextEPC

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Romeu Medeiros medeiros at medeiros.eng.br
Sat Jul 13 21:35:23 UTC 2019


Hello Sukchan and friends.

I'm trying to use the CSFB in test lab, and every time that nextepc send
the UEContextModificationRequest, the UE respond with an
UEContextModificationFaliure [ Protocol-cause=semantic-error ].

[image: image.png]

I'm looking why I'm getting this. Someone have any idea?

Thanks

Romeu Medeiros

On Thu, Jul 11, 2019 at 12:15 PM Sukchan Lee <acetcom at gmail.com> wrote:

> Dear Osmocom & NextEPC Community,
>
> Today I've added CS Fallback and released NextEPC v0.5.0
>
> So, I'd just like to test this part with Osmocom project, but it seems to
> be a difficult task. The reason is why I have little knowledge about 2G/3G.
> Nevertheless, I will try to do it
>
> BTW, I don't know if there is anyone who wants to integrate this big thing.
> Even though I'm not sure if this will help, but let me introduce the
> configuration of the NextEPC.
>
> To use SGsAP, change the mme.conf as follows:
>
> #
> #  <sgsap>
> #
> #  o Single MSC/VLR
> #    sgsap:
> #      addr: 127.0.0.2
> #      plmn_id:
> #        mcc: 001
> #        mnc: 01
> #      tac: 4130
> #      lac: 43690
> #
> #  o Multiple MSC/VLR
> #    sgsap:
> #      - addr: 127.0.0.2
> #        plmn_id:
> #          mcc: 001
> #          mnc: 01
> #        tac: 4131
> #        lac: 43692
> #      - addr
> #         - 127.0.0.3
> #         - fe80::2%lo0
> #        plmn_id:
> #          mcc: 001
> #          mnc: 01
> #        tac: 4132
> #        lac: 43692
> #      - name: msc.open5gs.org
> #        plmn_id:
> #          mcc: 001
> #          mnc: 01
> #        tac: 4133
> #        lac: 43693
> #
>
> FYI, I also attach the pcap that I run with nextepc simulator as below.
>
> $ ./tests/testcsfb
> mo-idle-test        : SUCCESS
> mt-idle-test        : SUCCESS
> mo-active-test      : SUCCESS
> mt-active-test      : SUCCESS
> All tests passed.
>
> Feel free to raise any questions about this things.
>
> Best Regards,
>     Sukchan
>
>
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