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    NEC DT900 ITK-6D-1P Non NEC SIP Firmware

    I have over 100 NEC DT900 ITK-6D-1P telephone i want to connect them to Grandstream UCM I opened the phone web interface and did all configuration, in the UCM its shows that the phone is registered and online but in the phone screen shows ( SIP Server Not Found ) and the phone can't send or...

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