Ok, so today I completed the final part of the installation - an old
coin phone in the foyer connected via a Grandstream ATA box.
I had tested many times (i had to hack the coin-phone to make it work
with the ATA) - calling from a software sip phone and the other line
on the ATA.
With the phone in situ, (i don't have openBTS gsm coverage in the
workshop) - I made a call from my mobile to the coin phone. the result
was no audio from the coin-phone to the mobile handset. At first i
thought it was the coin phone microphone, but then the audio came
through, i suspected a bad cable on the old phone, but process of
elimination tests brought me to the conclusion that it's only when I
call from OpenBTS. (I could not actually call the handset from the
coinphone due to the config of asterisk at the time. I will try to get
a chance to do this test tomorrow.)
I guess I would want to get some sip logs and do some wireshark on
this now, but there is no more time. I have to leave the setup and
wont see my ettus again for a few months. Then it will be impossible
to create exactly the same network setup. I thought I would post
anyway, as it's wierd that calls from other voip phones work fine, but
when I call from an OpenBTS MS I only have audio from the handset to
the ATA sip phone for the first 10 seconds or so, then it kicks in
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