[cisco-voip] Deploying 7961 Phones Remotely with ASA5500?

Thu May 7 10:47:36 EDT 2009

Ryan,

Even though the IP Phone would be embedding it's own private IP address
inside of SCCP ORCAck messages, the ASA Phone Proxy feature would know the
message was really sourced from the public IP. The Phone Proxy would handle
that, so that the Linksys doesn't have to worry about SCCP fixup.

One important caveat is that with PAT, not al homel routers support a TFTP
Client connection like the phone tries to do to the ASA Phone Proxy.

TFTP is destined to UDP port 69 for the initial Read Request, then a new
connection on an ephemeral port is negotiated, and not all home routers know
to look for this to open the new UDP Port.

If you run into TFTP problems you will have to configure the IP Phone's IP
to be in the DMZ so that all ports get forwarded to the IP Phone.

So, the short answer is that just about any home router should work with the
ASA Phone Proxy. Provided you're on the very latest ASA code (as PhoneProxy
is still a very new product).

On Thu, May 7, 2009 at 10:29 AM, Ryan Ratliff <rratliff at cisco.com> wrote:

> Your Linksys router is going to be doing NAT/PAT and I'm pretty confident
> they don't support SCCP fixup.  You will need the phone to either be in the
> DMZ or have a vpn tunnel behind the Linksys.
>
> -Ryan
>
>
> On May 7, 2009, at 10:12 AM, Miller, Steve wrote:
>
> Yes. I am just trying to make sure that there is nothing other than generic
> router (Linksys or whatever someone would normally have in their home) and
> the phone which are necessary to work with the the ASA55XX back at the
> network site.  We have been using VPN3002 boxes which are expensive and
> sometimes problematic to set up/program. Thank you for your feedback!
>
> Steve Miller
> Telecom Engineer
> Dickstein Shapiro LLP
> 1825 Eye Street NW | Washington, DC 20006
> Tel (202) 420-3370| Fax (202) 330-5607
> MillerS at dicksteinshapiro.com
>
>
>
> From: Matthew Loraditch [mailto:MLoraditch at heliontechnologies.com]
> Sent: Thursday, May 07, 2009 10:08 AM
> To: Miller, Steve; Cisco VOIP
> Subject: RE: Deploying 7961 Phones Remotely with ASA5500?
>
> What do you mean by necessary? If you can get your Linksys to setup a vpn
> tunnel then yes
>
>
>
>
>
> Matthew Loraditch
> 1965 Greenspring Drive
>
> Timonium, MD 21093
> support at heliontechnologies.com
> (p) (410) 252-8830
> (F) (443) 541-1593
>
> Visit us at www.heliontechnologies.com
> Support Issue? Email support at heliontechnologies.com for fast assistance!
>
>
>
> From: Miller, Steve [mailto:MillerS at DicksteinShapiro.COM]
> Sent: Thursday, May 07, 2009 10:05 AM
> To: Matthew Loraditch
> Subject: Re: Deploying 7961 Phones Remotely with ASA5500?
>
>
>
> Thanks. Only the phone is necessary, correct?
>
>
> Steve Miller
> Telecom Engineer
> Dickstein Shapiro LLP
> 1825 Eye Street NW
> Washington, DC 20006
> Tel (202) 420-3370
> Fax (202)-330-5607
> millers at dicksteinshapiro.com
>
> From: Matthew Loraditch
> To: Miller, Steve; Cisco VOIP
> Sent: Thu May 07 09:45:41 2009
> Subject: RE: Deploying 7961 Phones Remotely with ASA5500?
>
> Only the hardware needed to establish connectivity back to the cluster (VPN
> or direct via a t-1 or other circuit), and provide power for the phone.
>
> You could use an ASA5505 and that does poe and the vpn tunnel all in one
>
>
>
>
>
> Matthew Loraditch
> 1965 Greenspring Drive
>
> Timonium, MD 21093
> support at heliontechnologies.com
> (p) (410) 252-8830
> (F) (443) 541-1593
>
> Visit us at www.heliontechnologies.com
> Support Issue? Email support at heliontechnologies.com for fast assistance!
>
>
>
> From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-
> bounces at puck.nether.net] On Behalf Of Miller, Steve
> Sent: Thursday, May 07, 2009 9:34 AM
> To: Cisco VOIP
> Subject: [cisco-voip] Deploying 7961 Phones Remotely with ASA5500?
>
>
>
> Simple question:
>
>
>
> What hardware is required (if any) at the remote location to allow a Cisco
> phone to work?  My understanding was that hardware was unnecessary....that
> the phone could just hang off a regular Linksys router at a person's home.
> Please advise.  Thank you!
>
>
>
> Steve Miller
> Telecom Engineer
> Dickstein Shapiro LLP
> 1825 Eye Street NW | Washington, DC 20006
> Tel (202) 420-3370| Fax (202) 330-5607
> MillerS at dicksteinshapiro.com
>
>
>
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