GSMTAP messages not generated

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Mario Lucas mariolucas75 at mail.ru
Thu Oct 28 15:11:17 UTC 2021


Dear All,
 
I am running a GSM stack:
 
osmo-stp
smo-msc
osmo-hlr
osmo-bsc
osmo-bts-trx
osmo-trx-lms
 
It seems that my transmitter is emitting radio-waves into air (osmo-bts-trx and osmo-trx-lms communicate with each other through ports 5702 / 5802 — pls see attached printscreen), however i could not make GSMTAP tracing. Osmo-bts-trx does not send GSMTAP messages to port 4729.
 
In most recent version of osmo-bts, GSMTAP tracing is arranged through config file:
 
bts 0
  gsmtap-remote-host 127.0.0.1
  gsmtap-sapi ccch
 
 
I could not run the GSMTAP tracing even in previous verions of osmo-bts where you have to specify in synopsis when you call a program:
 
/usr/bin/osmo-bts-trx -s -c /etc/osmocom/osmo-bts-trx.cfg --gsmtap-ip 127.0.0.1
 
 
I thought may be i am having some issues in stack components behind osmo-bts for example in osmo-bsc or behind and i tried to run virtual bts.
When i tried to run osmo-bts-virtual GSMTAP messages were visible in wireshark (please see attached file osmo-bts-virtual), therefore bts-bsc communication is good.
 
However I still could not figure out why my osmo-bts-trx does not send GSMTAP messages.
Or would you advise what log might be helpful to see what i am doing wrong ….
 
Thank you for your always helpful assistance
 
--
Mario Lucas
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