[asterisk-biz] Is ISP Blocking VoIP

[Bill Michaelson]

Try [ssh] tunneling VoIP with one of them, just to see what happens?

J Thomas wrote:

>I provide hosted PBX service to businesses. About a dozen of them. All
>of them were working great, but this morning suddenly, 3 places have
>gone dead. None of the phones from those three places would register
>with my server :-(
>
>As the remaining 10 places are working just fine, hence I am reluctant
>to blame this failure on Asterisk.
>
>Changes is firewall setting at customer site could be a cause, but very
>unlikely that three of them decided to do that at the same time.
>Moreover, I specifically asked all three of them and none of them have
>messed up with their routers.
>
>Only thing common among them is that they all have business DSL from
>Verizon. Could it be that, possibly inadvertently, Verizon is doing
>something that is blocking VoIP? In any case, how to to find out why
>VoIP is not working? 
>
>In this case, all the clients have Polycom phones, about 30 among all
>three.
>
>Thanks,
>-- jt 
>
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