On Wed, Sep 21, 2016 at 05:47:34PM +0530, Dhananjay kumar wrote:
>  One more query regarding loop-back call :
>  "bts <0-0> trx <0-0> ts <0-7> lchan <0-1> loopback",
>
> we tried this command to start loop-back call once MS is registered to the
> network.
> But we are not seeing any loop-back call happening in nitb and osmo-bts
> logs.

This command only sets a loopback flag on a given lchan and does not actually
initiate a call. IIUC after setting the loopback, the loopback should happen
when you make a voice call using that time slot and lchan.
It might make more sense to start a call and set the loopback on the lchan
while the call is active. So this does not replace the other MS.

>From the code it seems the loopback flag is not cleared before / after a voice
call, so it looks like the given lchan will remain a loopback for any number of
calls (that end up on that lchan).

I'm not 100% sure though, only skimmed the code briefly,
I've never used this before.

~Neels