[Asterisk-Users] PSTN Incoming call on real line disrupts VoIP call over DSL circuit

[Bob Chiodini]

Thanks for the welcome.

I can't say too much about how BS does DHCP, my address is fixed.  I
would not expect the address to change too often.  When I had a DHCP
address I don't think it changed when the phone rang.

I've got a couple of these filters laying around.  BS hands them out
like candy when you move.  I could put one in an envelope and send it to
your father, or deliver if he's near me.  I'm in Brevard county.

Bob...

On Tue, 2006-05-09 at 08:55 -0400, Hadar Pedhazur wrote:
> Bob Chiodini wrote:
> > I'm a Bellsouth DSL user in FL too.  Here, the filter has a DSL/modem
> > jack and a POTS jack.  So if a phone and modem share the same wall plate
> > the filter does the split.
> 
> Interesting, I'm pretty sure that when they installed it in his 
> apartment, they put in the Y cable, so it's definitely a supported 
> Bellsouth configuration.
> 
> > I don't think connecting the DSL modem directly the loop is wise.
> > That's assuming that the filter actually filters something on the DSL
> > port and that the modem does not have a built-in filter.  My modem is a
> > Westell.
> > 
> > http://en.wikipedia.org/wiki/DSL_filter
> 
> Thanks.
> 
> > One other possibility, the ringing is causing packet loss (UDP) that the
> > HT486 is not handling very well.  Normal TCP traffic would generally
> > recover.  The streaming audio test should confirm the loss.  Does the
> > HT486 have any kind of logging?
> 
> I don't know about the logging, but you might be correct with regard to 
> the packet loss.
> 
> Rich Adamson conjectured that's it's a firewall issue, and it certainly 
> feels like that. Last night, it occurred to me that perhaps an answered 
> POTS line causes the modem to request a new DHCP lease, meaning, it 
> changes it's IP address. If that were the case, it would explain the 
> behavior I'm seeing, namely that we can continue to hear him, because 
> the HT can still find the remote end, but the remote end can no longer 
> find him...
> 
> I don't know how easily I can verify that (remotely, I'm not sure I can 
> talk my Dad through that one ;-), but perhaps I can prove that theory 
> one way or another...
> 
> > I'm still testing VOIP (read newbie) and have not run across this
> > scenario.  I'll add it to my list of things to test.
> 
> Welcome!
> 
> > Bob...