[cisco-voip] Voip NAT Traversal with CCM

[Justin Steinberg]

Yes, I have used IP Communicator and it works nicely with VPN.

However, we have employees who work from home full time and for these
individuals the business specifically wants "normal" phones :)

Justin




On 1/4/06, Sullivan,Gary,GREENWICH,Information Services
<gary.sullivan at waters.nestle.com> wrote:
> Have you thought about Cisco communicator / softphone
> I VPN in with my laptop and then use Communicator with a usb head set
> and have no problem.
>
>
> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net]On Behalf Of Justin Steinberg
> Sent: Wednesday, January 04, 2006 9:39 PM
> To: cisco-voip at puck.nether.net
> Subject: [cisco-voip] Voip NAT Traversal with CCM
>
>
> I'm getting more and more requests for telecommuters who wish to have
> an IP phone at their residence.  For ease of management I would prefer
> to just give the remote users an IP Phone and configure the phone with
> alternate TFTP to contact a public IP address of a CCM tftp server.
> Of course the CCM would have to be firewalled appropriately.
>
> The problem is that most of these users will plug their IP phone into
> a cheap dsl/cable NAT router which will lead to the problem of no way
> / one way voice. The  signalling will communicate with callmanager and
> the audio with a voice gateway or another IP phone.   Thus with the
> phone behind a "dumb" NAT router this solution won't work.
>
> Is there any solution that will get the job done without requiring any
> hardware on the end user side?  Any solution that requires purchasing
> a 79xx phone and a VPN capable router isn't going to fly.  The
> hardware costs and maintenance support required will not realize a
> cost savings over a PSTN line.
>
> I know SIP has session border controllers but I'd rather not have to
> worry about what phones are running SIP and what phones running SCCP.
>
> Are there any Session Border Controllers for SCCP or any other way to
> get past this NAT issue?
>
> I've read a little about IOS NAT Application Layer Gateways but I'm
> not an expert in that area.
>
> What are other people doing?
>
> Thanks
>
> Justin
>
> _______________________________________________
> cisco-voip mailing list
> cisco-voip at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>