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Polycom utilising Cisco WAN device not seeing remote video but remote can see us


Before I proceed,  I can say this, system was working fine before untill all of a sudden it cannot.

I Was called in as an expert to assist our Branch Tech who claims no changes were done.

Now here is the case:

When I test calling Polycom test sites, my video displays to them but I can't see their video.

I have captured some log files m the Polycom PC but could not pick out the fault.

PC can ping the remote end and virtually everything goes through out to Internet.

We come off an ISP through their VPN wireless link.

We have a cisco 2800 series router.

I am not too keen at the Remote end as they can see us not we cannot see them.

In Our Router we only have Static NT of the internal IP for the polycom PC to the Single Public IP which remote users use to call us.

Any help would be much appreciated.

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