I’ve installed a VITALPBX with SNOM and GRANDSTREAM phones, but some GRANDSTREAM PHONES like as GXP-2020, GXP-2140, BT100 have this issue:
When reach some number, the audio is missed.
We tried the call to the same numbers with SNOM phones and other GRANDSTREAM models and we don’t have any issue.
We’ve changed codecs configuration in the phones but the problem continue.
I’ll try update the phone.
Excuse me, when I said miss the audio means that when the user make a call to some numbers don’t have ring back, and on the display the call is connected, but the user can’t hear the voice of callee. With the same phone when call to other number not have problems, because of this environment I guess that is an codec issue.
One way audio issues is 99.9999% cause by NAT issues in your network, audio is simply not reaching the correct ports on your phones. So check you network config first