[cisco-voip] CUCM SIP To PSTN

[Lelio Fulgenzi]

The question I've had is, what is the best practice for this? Should you use a separate router for the CUBE functionality? Or use an existing gateway? I'm sure the answer is 'it depends' ;), but if there are some scenarios where it makes sense not to, that would be good to know. 

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On Jun 14, 2012, at 7:17 PM, Nick Matthews <matthnick at gmail.com> wrote:

> The scenario of:
> CUCM--SIP--GW--SIP--Provider
> 
> The gateway magically turns into a CUBE, and there's a whole bunch of
> marketing and technical information on what happens when you do that.
> 
> If you compare these two solutions:
> -CUCM direct SIP trunk to provider
> -Use MTP to keep media to a single IP
> -Or use NAT to keep internal addressing safe
> or
> -Use CUBE
> 
> There's a whole bunch of scalability and troubleshooting problems that
> can arise from the first. Having a demarcation point at the GW (CUBE)
> is extremely helpful. As well, it prevents you from needing to NAT SIP
> which historically is a pretty terrible idea.  It also has some SIP
> security and flexibility options, and is a good centralization point
> for trunks.
> 
> I haven't worked with anyone doing the direct trunk from CUCM to
> provider. Many providers are going to make their own rules which will
> include an SBC (industry term for CUBE).
> 
> Short story - just use an SBC. There's about 3-4 compelling reasons.
> 
> -nick
> 
> On Thu, Jun 14, 2012 at 1:17 PM, Adel Abushaev <adel.abushaev at gmail.com> wrote:
>> You can set up a SIP trunk to your SP, assuming that you are a SIP
>> client of them.Otherwise, if you want to go over T1, then  you need to
>> terminate SIP on the GW to translate between SIP and ISDN PRI or
>> whatever other signalling you are using between you and telco.
>> 
>> A.
>> 
>> On Thu, Jun 14, 2012 at 5:44 AM,  <george.hendrix at l-3com.com> wrote:
>>> Hi everyone,
>>> 
>>> 
>>> 
>>>   I know with h.323 gateways in CUCM, you have to configure dial peers on
>>> each gateway and for each CUCM.  Is it possible to create a SIP trunk
>>> directly from CUCM to the Telco?  Without having to do any dial peers on the
>>> gateway.  Or would it CUCM SIP <> SIP GW <> SIP PSTN, with SIP dial peers on
>>> the SIP GW for both CUCM and the PSTN?
>>> 
>>> 
>>> 
>>> Thanks,
>>> 
>>> 
>>> 
>>> Bill Hendrix
>>> 
>>> 
>>> 
>>> 
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>>> 
>> 
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