[srslte-users] srsEPC multiple SIM with same IMSI

[Pedro Alvarez]

Hi Ignas --

See my reply inline:

On Fri, Dec 7, 2018 at 8:00 AM Ignas Jarusevicius
<i.jarusevicius at limemicro.com> wrote:
>
> Hello,
>
> I have multiple test SIM cards with same IMSI/keys. Does srsEPC support
> connection of multiple UEs with the same IMSI? From my initial testing
> it seems that the second UE (with same IMSI) is unable connect once one
> is connected.

This is not a supported feature at the moment. This is probably not
very hard to implement, but I won't have the time to look into this
for a while.
I'll try to get a look at this at the end of next week, just to see
how much work is involved. Just to be clear, these SIM's use XOR as
the authentication algorithm, correct?

> Also, some time ago Pedro sent me a patch to make srsEPC work with sony
> Xperia F3111 phones:
>
> > diff --git a/lib/src/asn1/liblte_mme.cc b/lib/src/asn1/liblte_mme.cc
> > index 5cb00e5..59a86d9 100644
> > --- a/lib/src/asn1/liblte_mme.cc
> > +++ b/lib/src/asn1/liblte_mme.cc
> > @@ -320,7 +320,7 @@ LIBLTE_ERROR_ENUM
> > liblte_mme_pack_mobile_id_ie(LIBLTE_MME_MOBILE_ID_STRUCT  *mob
> >              odd = false;
> >          }else if(LIBLTE_MME_MOBILE_ID_TYPE_TMSI ==
> > mobile_id->type_of_id){
> >              id32 = mobile_id->tmsi;
> > -            length = 4;
> > +            length = 5;
> >              odd = false;
> >          }
> >          }else{
>
> However, it is still not in master. Is there a reason why it is not
> included? Does it cause issues for others devices?

Not sure why this didn't get into master. When I was trying to debug
the Xperia issue I tried multiple different things that In the end had
nothing to do with the actual issue.
When merging the actual solution back into next I probably just forgot
to add this part. Sorry about that, it's in next now and will be in
master for the next release.

> Regards,
> Ignas

Cheers,
Pedro