[VoiceOps] Enterprise customer desiring NAT for their SIP

Alex Balashov abalashov at evaristesys.com
Sun Feb 26 19:09:47 EST 2012

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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