Polycom Verizon ISDN Error 34

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 connected?

Thanks TC

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