The Graveyard - Products No Longer Supported > D-Link VoIP

DVG 600xg calling issue

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mos33:
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.

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