D-Link Forums
The Graveyard - Products No Longer Supported => D-Link VoIP => Topic started by: mos33 on December 27, 2020, 11:29:37 PM
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Hello, I have dlink DVG 6004G and 6008G GSM .
Observed the device is giving 503 service unavailable while trying to call "IP to GSM" although the SIM is not busy.
after a small time , the call is going well !
Please advise.