OpenBSC with A-interface

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Holger Hans Peter Freyther holger at freyther.de
Mon Sep 2 10:57:15 UTC 2013


On Sun, Aug 25, 2013 at 07:03:40PM +0400, Dmitri Soloviev wrote:
> Thank you
> 
> but there are few things still unclear:

> - why at A-bis interface BSC issues ip.accessMDCX with ip=0.0.0.0? is there
> anything configured improperly?

that is okay. The BTS has the OML/RSL connection. When the BTS is
receivng a 0.0.0.0 on the RSL link, it is supposed to send the RTP
to the IP address of the peer of the RSL link.


> - so, UDP port is BSC side is predicted. but an endpoint at BTS side is
> dynamically allocated.. is there a way to inform osmo-BSC_mgcp, or it just
> replies to RTP from BTS?

right. The osmo-bsc_mgcp will open two ports for each endpoint. One is
facing toward the BTS and is predicatble, the other will be dynamically
allocated and faces the network.




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