From: istong@stong.org
Date: Tue Nov 14 2006 - 15:31:16 ART
One thing to watch out for - I tried simple NAT with VOIP on
other firewalls such as a Cyberguard running 5.2 and could
not get bi directional calling using NAT. I could only get
it to work with a PIX v7.x as it has a NAT aware H323 proxy
that supports it. With the Cyberguard it would never
transition from the H323 traffic over port 1720 to the RTP
traffic.
Ian
www.ccie4u.com
> What about using a non-Cisco Proprietary IP Softphone over
> Cisco VPN Concentrator and then through a Checkpoint
> Firewall
>
>
>
> Eriksson CallManager ------------ Checkpoint Firewall
> -------- VPN Concentrator ----------- Internet -----------
> Remote ADSL Router ------- Cisco VPN Hardware Client
> (Network Extension Mode) ------- Remote Client
> PC(SoftPhone Installed)
>
>
>
> I've tried to get this setup working, but the Eriksson
> Softphone appears not to work fine, couldn't have been the
> Firewall as I've checked the logs on Checkpoint and there
> is no traffic blocked!!
>
>
>
> It's really driving me mad! I wonder how my CCIE Lab Exam
> will drive me in March then .....?
>
>
>
> Many Thanks
>
> _________________________________________________
>
> Olayemi Salau
>
> Network Analyst
>
> I.T. Solutions Division
>
> Southampton City Council
>
> ( 023 8083 4070 7 077 8811 2036 3 079 5825 7509
>
> * olayemi.salau@southampton.gov.uk
>
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]
> On Behalf Of Nouman, Khan
> Sent: 14 November 2006 08:34
> To: ccielab@groupstudy.com
> Subject: VOIP Over NAT
>
>
>
> Hi,
>
>
>
>
>
>
>
> Just off the topic.
>
>
>
> Can somebody provide me some reference documents about how
> voip works
>
> over NAT.
>
>
>
>
>
>
>
> Can an IP Phone at remote site register with central site
> Cisco
>
> CallManager over PAT or NAT ?????
>
>
>
>
>
>
>
> Waiting for response
>
>
>
>
>
>
>
>
>
>
>
> Regards
>
>
>
>
>
>
>
> Nouman
>
>
>
> __________________________________________________________
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