[cisco-voip] Gatekeeper architecture question

[Kelemen Zoltan]

To do that, your endpoints should support H.323 "Gateway" (not the same 
as GK!)

We used H.323-based ATA like devices that did this, but the video 
endpoints I have seen (not too many, I must admit) usually did not have 
this option.

CCM cannot act as a GK, so you need to point your endpoints to the 
CallManager as H.323 gateway, or the calls won't find their destinations.
I tried this with Sony PCS endpoints, and was able to set-up a voice 
only call from CCM->Sony, but there was just no way to do it the other 
way around without a GK (or without SCCP image, but that's another story 
:) )

regards,
  Zoltan

Jonathan Charles wrote:
> To be honest, I have never set an H.323 device up to CallManager
> (other than a gateway) without using a Gatekeeper...
>
> To be even more honest, I always just presumed it was a requirement of
> H.323 end-points, and never really investigated it (just every time I
> have set up an H.323 endpoint, a GK has been there and part of the BOM
> and the SOW... so I just took it as the gospel...)
>
> So, give it a try without a GK and tell us what happens... we really
> only see H.323 video endpoints here and we always use GKs...
>
>
>
> Jonathan
>
> On 6/4/07, c3voip <c3voip at nc.rr.com> wrote:
>   
>> I might be making this out to be more complicated than it needs to be.  If I
>> want the CCM to manage the bandwidth via Location-based CAC can't I just
>> setup my H.323 VC devices as H.323 clients on the CCM and point them at the
>> CCM?  Do I really need a gatekeeper if I have a working Location-based CAC
>> single cluster setup already?
>>
>> -C
>>
>> -----Original Message-----
>> From: Jonathan Charles [mailto:jonvoip at gmail.com]
>> Sent: Monday, June 04, 2007 4:32 PM
>> To: c3voip
>> Cc: ciscovoip
>> Subject: Re: [cisco-voip] Gatekeeper architecture question
>>
>> They should match...
>>
>> (Basically the Locations-based CAC was based on the GK concept of zones...)
>>
>> So, if you say, 'hey, Atlanta should be able to support 10 G.729
>> calls' and you set the Location to 240k, your Atlanta Zone should
>> match...
>>
>> However, you prob shouldn't even use locations-based bandwidth because
>> you are now using the BRQ message from the GK for CAC (CCM sends a BRQ
>> request to the GK requesting more bandwidth for a new call, GK says
>> 'hell no!' call fails...)
>>
>> BIG THING TO KEEP IN MIND: By default, CCM doesn't give a crap about
>> the BRQ denial... it just sends it as a courtesy... if you want AAR to
>> kick in on a BRQ deny, you need to enable the BRQ service parameter
>> for CCM.
>>
>>
>>
>> Jonathan
>>
>>
>>
>> On 6/4/07, c3voip <c3voip at nc.rr.com> wrote:
>>     
>>> How do the Gatekeeper zones interact with the Locations that are setup in
>>> the CCM? Or do they?
>>>
>>> I am trying to add 7985's and I want either the CCM's or the gatekeeper to
>>> know about all video calls from the VC units and the 7985's across the WAN
>>> links.
>>>
>>> -C
>>>
>>> -----Original Message-----
>>> From: Jonathan Charles [mailto:jonvoip at gmail.com]
>>> Sent: Monday, June 04, 2007 2:33 PM
>>> To: c3voip
>>> Cc: ciscovoip
>>> Subject: Re: [cisco-voip] Gatekeeper architecture question
>>>
>>> No.
>>>
>>> You need one gatekeeper... however, if it is down, so is video
>>> communications...
>>>
>>> (there are other solutions for this... but one should be sufficient
>>> with just five sites... I have one GK for 12 sites, but the remotes
>>> just talk to the main site, so if the main is down, no one cares)...
>>>
>>> Basically, you need to scale this up to your redundancy needs (aka,
>>> how many gatekeepers do you need to be able to sleep at night?).
>>>
>>> Anyway.
>>>
>>> Here's what you do. Drop a GK at the main site, have all of the video
>>> devices register to it. Define the CAC and bandwidth on it (using zone
>>> bandwidths) and you will be fine...
>>>
>>>
>>>
>>> Jonathan
>>>
>>> On 6/4/07, c3voip <c3voip at nc.rr.com> wrote:
>>>       
>>>>
>>>>
>>>> I have 5 regional sites that are connected back to my main site via
>>>> point-to-point serial connections.  I want to connect H.323 Video
>>>>         
>>> Conference
>>>       
>>>> devices at each site to my CCMs back at my main site.  Do I need six
>>>> gatekeepers (one at each regional site and one at my main site) to
>>>> successfully perform CAC/bandwidth mgmt. for the VC devices to call from
>>>> site to site?  Or can I use domains and just get away with using one
>>>> gatekeeper at my main site?
>>>>
>>>>
>>>>
>>>> Thanks,
>>>>
>>>> -C
>>>>
>>>>
>>>>
>>>>
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>>>> cisco-voip at puck.nether.net
>>>> https://puck.nether.net/mailman/listinfo/cisco-voip
>>>>
>>>>
>>>>         
>>>       
>>     
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