VoIP (VoiceWing) & Firewalls Help

[drew at drewtaylor.com (Drew Taylor)]

Matt Brodeur wrote:

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> On Thu, Aug 19, 2004 at 10:21:45AM -0400, Matt Brodeur wrote:
> 
>>On Wed, Aug 18, 2004 at 02:14:06PM -0400, Timothy M. Lyons wrote:
>>
>>
>>>Has anyone out here successfully setup a VoIP TA (Specifically
>>>Verizon VoiceWing / Cisco ATA 186) behind a firewall?
>>
>>   I passed your question along to a friend of mine who is (IIRC)
>>running a Cisco ATA (Vonage) behind his firewall.
> 
> 
>    OK, so the bad news is that with Vonage's VOIP service you wouldn't
> need to do anything special.  If you're behind a stateful firewall the
> ATA's SIP keepalive will keep the necessary hole open.
>    If it's not working with Verizon's service then they must be doing
> things differently, or your firewall isn't establishing states
> properly.

I just had a thought: you mentioned you're using Verizon. Are you using 
their DSL service as well? (Sorry, I don't have your first post). If so 
I believe you're probably using PPPoE, which will turn off the 
connection after a certain period. If your router has an option to do 
some sort of a PPPoE keepalive, try turning it on. Maybe the connection 
is going down which prevents the ATA from doing the SIP keepalive. Just 
a thought...

Drew
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