Guilherme: I searched the SRND and could find no such recommendation about that in relation to NAT. Can you share the page number in the v8.x guide? Frank -----Original Message----- From: Guilherme Loch Waltrick G?es [mailto:glwgoes at gmail.com] Sent: Monday, February 27, 2012 7:29 AM To: Frank Bulk Cc: Alex Balashov; voiceops at voiceops.org Subject: Re: [VoiceOps] Enterprise customer desiring NAT for their SIP 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 G?es 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.
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