Yes, mine was behind router. I run too many apps, site-to-site vpn's and servers at home. I also use a cisco asa router and firewall. Having the ht 502 in front of my router caused a lot of issues with my other applications. It also did not allow the throughput of my asa. The ht 502 was clearly open to all traffic from voipo.
So I believe it is truly a problem with the grandstream as Tim has been saying all along. Not anything with the Voipo network or servers.
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