OpenBSC with A-interface

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Dmitri Soloviev dmi3sol at gmail.com
Sun Aug 25 10:51:12 UTC 2013


Hi list,


Peter, thank you for your reply.

I still have questions about media control:

1) when parsing MGCP CRCX, sdp is not expected. May I change it?

2) I still can't run media in BSC mode. Seems I'm missing something.
osmo-bsc and osmo-bsc_mgcp are running
BSSAP works perfectly
But it seems two interfaces are working completely independent:
-- MGCP between MSC and BSC
-- interface between BSC and BTS (ip.access):
at MGCP, connection is acknowledged, endpoint is allocated (at BSC
ip=192.168.1.11)
at ip.access interface between BSC and BTS, BTS replies to ip.accessCRCX
with proper acknowledgement with proper ip:port at BTS (192.168.1.9) , then
BSC issues ip.accessMDCX with endpoint ip zero:
7e:73:01:09:f8:00:2d:*f0:00:00:00:00*:f1:0f:be:f4:00:f2:03
My attempts to modify connection at MGCP interface has no impact on
ip.access interface

The key question, I'm not getting how osmo-bsc and osmo0bsc_mgcp are
interacting.

Thank you,
Dmitri

PS my configs are
mgcp
  local ip 192.168.1.11
  bts ip 192.168.1.9
  bind ip 192.168.1.11
  bind port 2427
  rtp base 6000
  sdp audio payload number 3
  sdp audio payload name GSM/8000
  number endpoints 31
and

e1_input
 e1_line 0 driver ipa
network
 network country code 250
 mobile network code 07
 short name OsmoBSC
 long name OsmoBSC
 auth policy closed
 location updating reject cause 13
! encryption a5 1
 neci 1
 paging any use tch 0
 rrlp mode none
 mm info 1
 handover 0
 handover window rxlev averaging 10
 handover window rxqual averaging 1
 handover window rxlev neighbor averaging 10
 handover power budget interval 6
 handover power budget hysteresis 3
 handover maximum distance 9999
 timer t3101 10
 timer t3103 0
 timer t3105 0
 timer t3107 0
 timer t3109 0
 timer t3111 0
 timer t3113 60
 timer t3115 0
 timer t3117 0
 timer t3119 0
 timer t3122 0
 timer t3141 0
 dtx-used 0
 subscriber-keep-in-ram 0
 bts 0
  type nanobts
  band PCS1900
  cell_identity 2611
  location_area_code 51601
  training_sequence_code 7
  base_station_id_code 63
  ms max power 15
  cell reselection hysteresis 4
  rxlev access min 0
  channel allocator ascending
  rach tx integer 9
  rach max transmission 7
  ip.access unit_id 1801 0
  oml ip.access stream_id 255 line 0
  neighbor-list mode manual-si5
  gprs mode none
  trx 0
   rf_locked 0
   arfcn 810
   nominal power 0
   max_power_red 20
   rsl e1 tei 0
    timeslot 0
     phys_chan_config CCCH+SDCCH4
     hopping enabled 0
    timeslot 1
     phys_chan_config TCH/F
     hopping enabled 0
    timeslot 2
     phys_chan_config TCH/F
     hopping enabled 0
    timeslot 3
     phys_chan_config TCH/F
     hopping enabled 0
    timeslot 4
     phys_chan_config TCH/F
     hopping enabled 0
    timeslot 5
     phys_chan_config TCH/F
     hopping enabled 0
    timeslot 6
     phys_chan_config TCH/F
     hopping enabled 0
    timeslot 7
     phys_chan_config TCH/F
     hopping enabled 0
msc
! ip.access rtp-base 6000
 timeout-ping 20
 timeout-pong 5
 dest 192.168.50.10 5000 0

in fact, BSSAP goes from a card over VPN, while MGCP comes from
self-written TRAU running locally, the same host as BSC
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