Hello , I have few 3cx implementations with GSM gateway TG400 and everything works ok . Now, with my latest installation i have problem when clients are making calls trough GSM gateway, sometimes call quality seems ok, but most of the time call quality is very bad , sometimes callee can not hear caller or vice versa , sometimes they can hear but voice quality is so bad. Internal calls are great, calls trough Sip trunk are more than good (I have Layer 2 connection with my ISP when it comes to SIP, not over the internet). Gateway is on the same firmware and configured exactly like other before it. GSM gateway is in the same LAN as PBX. Forget to mention that GSM call quality is even worse trough 3CX apps wich are in WLAN.
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