[VoiceOps] Enterprise customer desiring NAT for their SIP

[joshua sahala]

frank,

On Mon, Feb 27, 2012 at 6:49 AM, Alex Balashov
<abalashov at evaristesys.com> wrote:
> On 02/26/2012 11:34 PM, Frank Bulk 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.

in addition to the un-nat-magik on the sbc, the asa/pix will try to
translate not just the header, but the sip messages themselves (sip
inspection/sip fixup)
http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a008081042c.shtml#sip

unless they have a very small fw, resources should be ok (i have done
>200Mbps with a 72xx doing the nat/sip mangling @50% cpu, iirc)


/joshua