gsmopen: fix FS-4150 , deleted a spurious new_inbound_channel(), checked all gsmopen->fs->sip machinery, then I got problems with audio(only in gsmopen->fs->sip not the reverse): I was baffled by a snom bug for a week, then I tested with Xlite and worked, so I grow suspicious, I updated snom320 firmware and worked. Hate those things