Question about Polycom ISDN BRI Cable (2457-08341-001)
Mostly generated due to a firewall configuration issue.
The problem is to identify which firewall needs adjusting; the one at your site or the one at the other site (be persistent, the other site usually claims that their configuration is correct *wink*).
A good list of needed ports for videoconferencing can be found here:
Posted on Nov 07, 2012
Dial area code first then try to call some one.
Posted on Feb 22, 2011
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Posted on Jan 02, 2017
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