I found this in the 3GPP documentations [1]:
[image: image.png]
I will change the code to send only the CSFallback indicator in this case
to see if can solve the problem.
Thanks
Romeu Medeiros
1.
On Sat, Jul 13, 2019 at 6:35 PM Romeu Medeiros <medeiros(a)medeiros.eng.br>
wrote:
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(a)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
>
>