osmo-gsm-tester: add voice call test
Add a test case that performs a voice call (probably in a new test suite called 'voice').
Add various scenario configurations picking phys_chan_config timeslot types (TCH/H, TCH/F, TCH/F_TCH/H_PDCH, TCH/F_PDCH) as well as various voice codecs.
See [[cellular infrastructure:Weekly BTS Tests]] for inspiration.
Concentrate on sysmoBTS so far, and osmo-bts-trx if it already works.
Ignore oct and nanoBTS.
- Priority changed from Normal to High
To clarify, this is only about voice call signalling, not about analysis of the actual voice stream or audio sent/received on either side. The test should merely place a call, somehow query that a voice call was launched (maybe implement new CTRL interface queries?) and then hang up.