[VoiceOps] Screwy DSL modem NAT troubles

[Matthew S. Crocker]

Zoom X5 routers used to work but their new version doesn't
Zhone DSL routes used to work but their new version doesn't
Netopia/Motorola seem to work ok

Never have problems with Sonicwall if we shut the SIP ALG off.
Cisco ASA with SIP inspection on work well

I'm going to reconfigure my Acme to accept SIP on port 8060 or something and see if that works with these junky DSL

----- Original Message -----
> From: "Carlos Alcantar" <carlos at race.com>
> To: VoiceOps at voiceops.org
> Sent: Tuesday, February 22, 2011 1:19:07 AM
> Subject: [VoiceOps] Screwy DSL modem NAT troubles
> Linksys ALG seems to break everything sip on the firewall side
> sonicwall seems to be the death of sip.
> 
> 
> Carlos Alcantar
> Race Communications / Race Team Member
> 101 Haskins Way, So. San Francisco, CA. 94080
> Phone: +1 415 376 3314 Fax: +1 650 246 8901 / carlos *at* race.com /
> www.race.com
> 
> 
> 
> -----Original Message-----
> From: voiceops-bounces at voiceops.org
> [mailto:voiceops-bounces at voiceops.org] On Behalf Of Carlos Alvarez
> Sent: Monday, February 21, 2011 3:08 PM
> Cc: voiceops
> Subject: Re: [VoiceOps] Screwy DSL modem NAT troubles
> 
> We go through this all the time with Qwest DSL customers.
> Unfortunately I don't have model numbers for you, we stopped
> documenting things when we noticed that they have all new modems every
> few months. However we've had success with having the customer call
> Qwest and tell them they want to run VoIP phones, the Qwest reps seem
> to know that as a trigger and send a compatible modem. I do recall
> that the best ones are Netopia, and we've had good support when we
> engage them directly via chat.
> 
> We also find that modems start going bad slowly after a couple years,
> and VoIP is the first to get impacted, of course.
> 
> 
> 
> Matthew S. Crocker wrote:
> > Has anyone else noticed that the latest batch of DSL modems have
> > broken NAT when it comes to VoIP? I'm seeing stable VoIP customer
> > get broken when the DSL modem is swapped out. The modem NATs the
> > phones to modem IP port 5060. So, 10 phones behind the router become
> > one phone to the SBC. A race condition occurs and phones go in and
> > out of service at random. It looks like the router is trying to do a
> > SIP ALG but very very broken.
> >
> > Do anyone have a DSL modem/router they use that works well with
> > VoIP?
> >
> 
> 
> --
> Carlos Alvarez
> TelEvolve
> 602-889-3003
> 
> 
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-- 
Matthew S. Crocker
President
Crocker Communications, Inc.
PO BOX 710
Greenfield, MA 01302-0710
http://www.crocker.com
P: 413-746-2760