[VoiceOps] Enterprise customer desiring NAT for their SIP

[Guilherme Loch Waltrick Góes]

Alex,

Per  the Cisco SRND the recommend setup is to terminate the SIP trunk
on a SBC inside a DMZ and setup a trunk between the CUCM cluster and
the SBC. Cisco routers have a basic SBC called CUBE, maybe your client
already have a router with such features, you should try that.

Regards,

Guilherme Loch Góes



On Mon, Feb 27, 2012 at 1:34 AM, Frank Bulk <frnkblk at iname.com> wrote:
> Yes, our SBC does supports the usual NAT traversal features, but our
> customer will have more than one trunk with us...they have several two PRIs
> today, so it will be 15 to 20 active trunks on a regular basis and almost 30
> at peak.
>
> Frank
>
> -----Original Message-----
> From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org]
> On Behalf Of Alex Balashov
> Sent: Sunday, February 26, 2012 6:10 PM
> To: voiceops at voiceops.org
> Subject: Re: [VoiceOps] Enterprise customer desiring NAT for their SIP
>
> On 02/26/2012 05:15 PM, Frank Bulk wrote:
>> We have an enterprise customer that wants to trial our SIP trunking
> service.
>> They're using Cisco Call Manager v8.5 and I tried to get them to use a
>> public IP or a private VLAN to our network, but he insists that they want
> to
>> keep their CCM behind their NATing firewall.
>>
>> Our softswitch has an integrated SBC, so our side is covered, but I'm
> afraid
>> that they may run into some issues that are related to NAT but that we'll
> be
>> held responsible.
>>
>> Should I continue to push back on this customer, or let them go down this
>> road?
>
> If your SBC supports all the usual far-end NAT traversal measures, you
> should be good, particularly since this is just a single trunk.
>
>
> --
> Alex Balashov - Principal
> Evariste Systems LLC
> 260 Peachtree Street NW
> Suite 2200
> Atlanta, GA 30303
> Tel: +1-678-954-0670
> Fax: +1-404-961-1892
> Web: http://www.evaristesys.com/, http://www.alexbalashov.com/
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