Hi!

Can we still use osmocomBB phones (C140,C139..) with Osmo-BTS project?

Yes.

I use transceiver  program from *jolly/testing* branch and
firmware in compal_86 ( trx.highram.bin ) from  *sylvian/testing* branch,
all from osmocomBB.

Stop doing this mix. The firmware from one branch you use incompatible with host software form another. Use one branch only!

It looks like you have a new toolchain "gnu-arm-build.3.sh". The firmware images from this branches works better if it's compiled with older toolchain version.

Try to use http://bb.osmocom.org/trac/attachment/wiki/GnuArmToolchain/gnu-arm-build.2.sh or https://github.com/axilirator/gnu-arm-installer.

I know that Calypso BTS support only one timeslot.

Using two phones you will be able to serve two timeslots.

Follow this guide I recently wrote: http://bb.osmocom.org/trac/wiki/Tutorials/CalypsoBTS
http://openbsc.osmocom.org/trac/wiki/SDR_OsmoTRX_network_from_scratch is outdated.

С наилучшими пожеланиями,

Яницкий Вадим.