Re: sip trunk

Dear Nick,

I am very much obliged for the support, just have couple of more questions,

1. Some more details on MTP, from where I can get it, is it builtin in
Cisco IOS.
2. Do Asterisk work fine in this scenarrio or it also require CUBE
type of thing and what is the realiabiliy of B2BUA.

Best regards,
Asim Zafar

On Fri, Dec 3, 2010 at 1:48 AM, Nick Matthews <matthn_at_gmail.com> wrote:
> Without CUBE you will have to NAT all of your private IPs from your
> phones/CUCM. Alternatively you could put a MTP in a DMZ. Both of these
> solutions are far from optimal because the NAT option requires for your
> firewall to keep up with SIP traffic/standards (historically terrible) or
> for you to put an internal CUCM component reachable from the internet (not a
> fantastic idea either). CUCM 5.1 is also not very good at SIP, so there's a
> good chance you'll run into problems. Your provider will require early
> offer, which will require an MTP on CUCM, which will mean all calls will be
> G.711. I would confirm your MTP resources to make sure that's alright.
>
> So yes, you really should be using a CUBE here.
>
> -nick
>
> On Thu, Dec 2, 2010 at 1:03 PM, Asim Zafar <asim.mz_at_gmail.com> wrote:
>>
>> Dear Ryan,
>>
>>
>> Thanks for you reply.
>>
>>
>> Is it necessary to use CUBE or just a best practice. Can i achieve all
>> the requirements without CUBE.
>>
>>
>> Best regards,
>> Asim Zafar
>>
>> On Thu, Dec 2, 2010 at 5:00 PM, Ryan West <rwest_at_zyedge.com> wrote:
>> > Asim,
>> >
>> > I would read through this document which outlines a majority of the
>> > concerns.
>> >
>> >
>> > http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a00808b6ca6.shtml
>> >
>> > With 5.1 I would recommend connecting your CM to CUBE and having it deal
>> > with the SIP trunk.
>> >
>> > -ryan
>> >
>> > -----Original Message-----
>> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>> > Asim Zafar
>> > Sent: Thursday, December 02, 2010 1:57 AM
>> > To: Cisco certification
>> > Subject: sip trunk
>> >
>> > Dear experts,
>> >
>> >
>> > I need to connect my CUCM 5.1 with sip proxy on telco side.IP phones
>> > will connect to CUCM.
>> > The SIP server provide 90 lines with real numbers
>> >
>> >
>> > Following is the scenario.
>> >
>> > Cisco IP phones----------CUCM-------WAN connection to telco---------SIP
>> > proxy server.
>> >
>> > Can anybody explain me how this will work, what will be the
>> > configurations and if CUCM has the capability to control the calls between
>> > IP phones and SIP server.
>> >
>> >
>> > --
>> > Thanks & Regards,
>> >
>> > Asim Zafar
>> >
>> >
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>> >
>> >
>> >
>> >
>> >
>> >
>> >
>>
>>
>>
>> --
>> Thanks & Regards,
>>
>> Asim Zafar
>>
>>
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>>
>> _______________________________________________________________________
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>>
>>
>>
>>
>>
>>
>>
>
>

-- 
Thanks & Regards,
Asim Zafar
Blogs and organic groups at http://www.ccie.net