[cisco-voip] gatekeepers - when, why, how?

[Justin Steinberg]

can you tell us about the environment and requirements for what you are
trying to accomplish ?

For a simple SRST site, it is not too difficult to use wildcard dial-peers
to route calls between various IOS devices that are in SRST mode.  I'm not
sure how useful a gateway or SAF would be in this scenario since you would
still need to configure the endpoints (FXS) with their phone numbers.

If you have a handful of  MGCP VG224s at a remote site, you would typically
need h323 dial-peers on the VG224 to process calls when in SRST mode.

Typically, I pick one IOS device to be the central SRST gateway.  Usually
this is the PSTN gateway.  i then create a wildcard voip dial-peer for each
VG224 and set a preference.  the central SRST gateway will try SRST VG224
#1, if that gw has a dialpeer for the extension the call is connected,
otherwise the call is rejected and send back to central SRST GW where the
call is routed to the next dial-peer.  it all happens fairly quickly and is
transparent to the users.

the kicker is that you need to setup 'allow connections h323 to h323' only
on the central site gw and not on the vg224s - this way the vg224s properly
reject calls back to the central gw for extensions that they do not own.

the solution to all this IOS work is to configure the VG224s with SCCP and
have them register back to the SRST router.  depending on how many VG224s
you have this may not be possible.



On Mon, Apr 12, 2010 at 1:54 PM, Lelio Fulgenzi <lelio at uoguelph.ca> wrote:

> Thanks. Just checked the feature navigator. It mentions SAF feature is
> available on VG224 platform releases.
>
> But as I found out earlier, if SAF is not on the VG224 data sheet, it's not
> supported by TAC. :(
>
> I could always try and use a gatekeeper as a fallback.
>
>
>
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Cooking with unix is easy. You just sed it and forget it.
>                               - LFJ (with apologies to Mr. Popeil)
>
>
> ----- Original Message -----
> From: "Chris Ward (chrward)" <chrward at cisco.com>
> To: "Lelio Fulgenzi" <lelio at uoguelph.ca>, "Mike King" <me at mpking.com>
> Cc: "cisco-voip voyp list" <cisco-voip at puck.nether.net>
> Sent: Monday, April 12, 2010 1:52:34 PM GMT -05:00 US/Canada Eastern
> Subject: RE: [cisco-voip] gatekeepers - when, why, how?
>
>  SAF is modeled after EIGRP, but does not require EIGRP. If the feature
> navigator says you are good, maybe you are in luck.
>
>
>
> +Chris
>
>
>
> *From:* cisco-voip-bounces at puck.nether.net [mailto:
> cisco-voip-bounces at puck.nether.net] *On Behalf Of *Lelio Fulgenzi
> *Sent:* Monday, April 12, 2010 1:44 PM
> *To:* Mike King
> *Cc:* cisco-voip voyp list
> *Subject:* Re: [cisco-voip] gatekeepers - when, why, how?
>
>
>
> Thanks Mike. Definitely clears up the configuration steps and I'll have to
> read up a bit more on whether a device should be a forwarder or a client,
> but it still doesn't mention anything about supported devices. Last I talked
> with the TAC, EIGRP routing was not supported on the VG224 (even stub,
> although it's listed in the feature navigator), so if SAF is anything like
> EIGRP (which it sounds like it is, I'm guessing the VG224 team might likely
> say no to this as well. :(
>
>
>
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Cooking with unix is easy. You just sed it and forget it.
>                               - LFJ (with apologies to Mr. Popeil)
>
>
> ----- Original Message -----
> From: "Mike King" <me at mpking.com>
> To: "cisco-voip voyp list" <cisco-voip at puck.nether.net>
> Sent: Monday, April 12, 2010 12:49:28 PM GMT -05:00 US/Canada Eastern
> Subject: Re: [cisco-voip] gatekeepers - when, why, how?
>
> Lelio,
>
> Take a look at this, it might help a little:
>
>
> http://www.cisco.rw/en/US/docs/ios/saf/configuration/guide/saf_cg.pdf
>
>
>
>
>
> On Mon, Apr 12, 2010 at 12:11 PM, Lelio Fulgenzi <lelio at uoguelph.ca>
> wrote:
>
> hmmm, doesn't look like the VG224 supports this. :(
>
>
>
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Cooking with unix is easy. You just sed it and forget it.
>                               - LFJ (with apologies to Mr. Popeil)
>
>
> ----- Original Message -----
>
> From: "Chris Ward (chrward)" <chrward at cisco.com>
> To: "Robert Kulagowski" <rkulagow at gmail.com>
> Cc: "Lelio Fulgenzi" <lelio at uoguelph.ca>, "cisco-voip voyp list" <
> cisco-voip at puck.nether.net>
> Sent: Monday, April 12, 2010 12:08:19 PM GMT -05:00 US/Canada Eastern
> Subject: RE: [cisco-voip] gatekeepers - when, why, how?
>
> Try this:
>
> http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/8x/netstruc.html
> #wp1155951
>
> It's from the SRND so it should be more descriptive.
>
> +Chris
>
>
> -----Original Message-----
> From: Robert Kulagowski [mailto:rkulagow at gmail.com]
> Sent: Monday, April 12, 2010 11:17 AM
> To: Chris Ward (chrward)
> Cc: Lelio Fulgenzi; cisco-voip voyp list
> Subject: Re: [cisco-voip] gatekeepers - when, why, how?
>
> On Mon, Apr 12, 2010 at 9:09 AM, Chris Ward (chrward)
> <chrward at cisco.com> wrote:
> > Well, that just means your UCMs can't join the SAF network. The SAF
> > forwarders and other IOS devices just need a 15.X IOS and they should
> be
> > able to participate.
>
> Can you provide additional information on how this can be useful in a
> voice environment?  Configurations, etc?  The two links don't have
> much, and one basically just punts:
>
> "
> Q. I understand SAF can greatly simplify my voice-over-IP (VoIP)
> deployment. Where can I find more information on how to deploy SAF
> with my Unified Communications 8.0 application?
> A. Please contact the Voice Technology Group through your account
> representative or reseller for more information or visit
> http://www.cisco.com/go/saf.
> "
>
> Are you in the Voice Technology Group?  Can we consider this a
> "contact"? :)
>
>
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