Re: ABIS over IuB SCTP

Hello, I found this document on the net: https://www.academia.edu/19659583/Documents_mx_zxsdr-bs8900-gu360v40921-out… For Abis when using the ethernet port it is using SCTP for control plane messages and after encapsulated in IP and for user plane it is using RTP and then encapsulated in UDP. There is no clear document for Huawei multi-standard boxes but I know that for Abis over IP you need to define IPPATH which is probably SCTP to provide dual-homing feature. Regards, R. Sent from my Mobile On 02.06.2018, at 15:08, Borjan Jovanovski <jovanovskiborjan(a)gmail.com> wrote: Further clarification: Regarding my initial mixup of standard iub / abis, it was because of this, when i first met the problem i googled for a solution and ran into this: https://osqa-ask.wireshark.org/questions/23531/abis-over-iua-decoding it was actually abis over IuA. On Sat, Jun 2, 2018, 14:57 Borjan Jovanovski <jovanovskiborjan(a)gmail.com> wrote: > Hi Harald, > > We are talking about a ZTE MacroBTS ZXSDR BS8900A. > > And about your further questions, your final statement is correct it is > standard abis dialect encapsulated in SCTP, i can provide documentation at > a later time as i am not home at the moment, but i can tell you now that, > the SCTP protocol is terminated in a switch type device before the bsc > hardware, and then further communication continues over tcp to the bsc. > Regards, > Borjan > > On Sat, Jun 2, 2018, 14:50 Harald Welte <laforge(a)gnumonks.org> wrote: > >> Hi Borjan, >> >> On Sat, Jun 02, 2018 at 02:15:38PM +0200, Borjan Jovanovski wrote: >> >> > my device is a multimode device BTS NodeB and eNodeB 2G + 3G + 4G and >> > uses SCTP protocol for BSC RNC and MME connection >> >> Can you tell us more about that device? >> >> > ... but i couldn't get OpenBSC to work with abis over sctp. So my >> final question is: >> > How to handle Abis over SCTP with OpenBSC. >> >> To the best of my knowledge, there is no 3GPP specification for Abis >> over SCTP. >> >> As such, it's not a surprise that we're not implementing it in OsmoBSC :) >> Maybe I missed something. Can you please point me to relevant >> specification for this Abis dialect? >> >> I would assume it's some vendor-specific dialect. Do you have >> protocol-level >> documentation for that available? Do you have protocol traces of this >> dialect? >> >> In any case, even with documentation and/or traces, you would need to >> develop the respective code to interface this new Abis >> dialect/encapsulation. The required effort depends on how far that >> dialect diverges from the existing "known" dialects/formats. If it's >> just 08.58 RSL and 12.21 OML inside SCTP, then it should be rather >> little effort. But that's a big "if" :) >> >> Regards, >> Harald >> -- >> - Harald Welte <laforge(a)gnumonks.org> >> http://laforge.gnumonks.org/ >> >> ============================================================================ >> "Privacy in residential applications is a desirable marketing option." >> (ETSI EN 300 175-7 Ch. >> A6) >> >