Re: [dispatch] SIP and GSM/UMTS with OpenBTS

[Jiri Kuthan <[e-mail]>]

/* loosely answering to several other emails */

my esthetic preference is to leave policing spectrum to other more skilled
organizations in the area than IETF. I mean whether someone's deployment of
a BTS of any kind is  legitimate in a region or not seems to me way far
beyond protocol  design.

I think the "usual IETF question" which Michael H. has reiterated few times
is if there is some IETF protocol design  work to be  done on the subject.
It is my impression that this is not clear  yet, neither to the  openbts
folks nor to the IETF folks. Not meaning to be critical -- many  of most
good things emerge of some degree of initial chaos :)

Perhaps openbts works just perfect out of the box, and a useful contribution
would be a "gateway BCP" like RFC3666 which helped especially in the early
SIP adoption days. Maybe there are some hand-over aspects, authentication
aspects -- I think it is worth trying to find it out.

-jiri



On 2/14/14 8:57 AM, Ivo Sedlacek wrote:
> Hello Tim and all,
>
>> Apples and oranges - If I want a continent spanning, roaming capable billion dollar GSM network, then I need an IMS system.
>> If I want an Um to SIP gateway I can run off solar power and hang in a tree, I'll go for an openBTS like solution.
>
> If you want an Um to SIP gateway (for whatever purpose), you need a license.  To get a license, you will need to satisfy regulator's requirements.
>
> You still have not provided any references to regulators' document stating that a GSM band is free in any country.
>
> You still have not explain how such BTS "running off solar power and hanging in a tree" does not interfere with other BTSs hanging on the next tree.
>
> So, I am afraid, the BTS and Um To SIP gateway hanging will be switched off pretty quickly due to being illegal or causing interferences with other GSM nodes.
>
> Kind regards
>
> Ivo Sedlacek
>