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  1. chris_c_

    NO JOY No audio 603 Decline Nortel 1535 SIP video phone

    Alert, this is probably a stupid question, but I'm tearing out my hair over this and can't seem to find the answer. Just got the famous Nortel 1535 SIP video phone !! No joy! Calls are dropping instantly with no audio AND 603 DECLINE sip message!! Details: The phone registers OK into the...
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