[SIPForum-discussion] SIP Trunk Delivery from Telco Carrier

[Fortunato Lacson]

Good morning all. So far it looks like that both implementations happen out
there. I would imagine this depends on the scale of the project.

We are on the preliminary planning stage. We needed a SIP trunk that would
deliver us 9,000 concurrent incoming calls (minimal outbound) at G.711. The
plans is to get 2 X 1 GigEthernet pipe to the public Internet for this
purpose only. We are looking at about 2 to 3 SIP providers passing us the
calls over it.

To me, personally, this is quite a big implementation. My personal worry is
the reliability of the internet to deliver all that calls.

Gui, I am wondering what kind of numbers in your implementations look like
and if you do get dropped calls from erratic internet conditions. Any other
problems encountered? I believe the SIP aware firewall intent other than NAT
is to close ports after call termination to avert DoS attacks. TLS should be
done on the SIP Proxy.

Mark, I like the beauty of the implementation. It's simple and controlled
environment. Is the SBC security you are referring to TLS? We are in Canada
and most of the SIP calls are coming from the US so getting a single vendor
solution may be a long-shot but yet to be explored.

Roland, MPLS is also what I thought should be a good option as it take away
security worries. IPSec VPN is indeed too resource intensive, especially on
my case i think.

Jamie, what are METS?

George, likewise, I do think MPLS is the way to go. I have yet bring this up
to the group. I wonder though what the cost differences would be and if
appealing enough.

Do SIP Providers implement packet marking? This would prioritize voice from
data as it traverses the network.

Does anyone see why our preliminary plan might not work as expected? My
thought is if we would experience dropped packets over the internet and not
attain our target, is to drop our CODEC to maybe G.729 but right now that is
out of the question.


Thanks and regards to all.


Fortunato



On Wed, Oct 1, 2008 at 6:26 AM, FETCHO, GEORGE
<GEORGE.FETCHO at mcleodusa.com>wrote:

>  Fortunato & all, the larger telco vendors will attempt to carry as much
> of the SIP traffic on their private MPLS or ATM backbones, not public
> internet. Depending on the destination, they'd interconnect the call &
> hand-off to a local PSTN Central Office, other telco or internet connection.
> Hope this helps. Thanks--George
>
> -----Original Message-----
> *From:* discussion-bounces at sipforum.org [mailto:
> discussion-bounces at sipforum.org]*On Behalf Of *Fortunato Lacson
> *Sent:* Tuesday, September 30, 2008 11:53 AM
> *To:* discussion at sipforum.org
> *Subject:* [SIPForum-discussion] SIP Trunk Delivery from Telco Carrier
>
>  Hello All.
>
> For those who have experience taking SIP trunk from Telco Vendors. Do you
> take it through the open internet? Or, do you take it using some form of
> tunelling (virtual WAN), or maybe something else. What would be the
> advantage or disadvantage of each. Also, what forms of security measure, if
> any, do you implement while traversing it.
>
>  I would like to get a feel of real world implementation.
>
>
> Good day,
>
> Fortunato
>
>
>
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