[VoiceOps] Enterprise customer desiring NAT for their SIP

Frank Bulk frnkblk at iname.com
Sun Feb 26 23:34:50 EST 2012

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.


-----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
> 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
> keep their CCM behind their NATing firewall.
> Our softswitch has an integrated SBC, so our side is covered, but I'm
> that they may run into some issues that are related to NAT but that we'll
> 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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