Polycom Verizon ISDN Error 34

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Hi All,

    We have a Polycom ViewStation 512MP that is connected to 4 ISDN lines.
We don't have problem with National(USA) calls but We keep experiencing
problem with International calls.  We usually get ISDN error 34.
Strange thing is that I can use a regular phone set to make
international phone call with these ISDN lines.

    I call both Verizon and polycom.  For sure, they will blam on the
other.  Anybody have any tips or clues to get international call


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