[cisco-voip] vg224 vs vg248

Tue Apr 11 08:33:27 EDT 2006

Is anything we ever do "TAC Supported"  I know alot of things I do are not 

"Ed Leatherman" <ealeatherman at gmail.com>
Sent by: cisco-voip-bounces at puck.nether.net
04/11/2006 07:26 AM

        To:     "Lelio Fulgenzi" <lelio at uoguelph.ca>
        cc:     "Madziarczyk, Jonathan" <JMad at cityofevanston.org>, 
cisco-voip at puck.nether.net
        Subject:        Re: [cisco-voip] vg224 vs vg248

Ok, here is what I have found so far from my SE about the 
vg224/SCCP/redundant Link scenario...

This is undocumented on CCO at the moment (unless it's hidden real good)
If you bind SCCP to the L0 interface, you can use the MAC address for f0/0 
in callmanager to set up the ports and it works fine. you can shut down 
f0/0 or unplug it and it will keep working from the f0/1 interface. I dont 
have any additional details yet but that sounds promising.. I'm trying to 
get an official nod that this setup would be TAC supported. 

On 4/10/06, Lelio Fulgenzi <lelio at uoguelph.ca> wrote:
Excellent comments, thanks. I, for one, appreciate the time and effort 
people on this list put in to helping each other out.

Lelio

--------------------------------------------------------------------------------
Lelio Fulgenzi, B.A.
Network Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Sanity First : Number of days with fewer than
50 messages in my inbox at the end of the day:   buffer overrun
----- Original Message ----- 
From: Madziarczyk, Jonathan 
To: cisco-voip at puck.nether.net 
Sent: Monday, April 10, 2006 1:47 PM
Subject: Re: [cisco-voip] vg224 vs vg248

For the Loopback address, let me explain some of my statement.  You can 
enter a Loopback address.  We use EIGRP at our site.  VG224 does not 
support EIGRP, it does seem to support RIP and OSPF.  RIP could cost you a 
subnet to have a loopback (not sure if v2 is supported).  I didn't feel 
like redistributing EIGRP into OSPF just for one device (if you have 
multiple vg224s in one location that may make more sense for you).  The 
other option is to set multiple static routes on the VG224 and your 
default gateways to get that loopback address into your routing tables. 
My philosophy is:  These are phones, there is a much higher expectation of 
uptime and low-latency.  Do I want to support fancy and complicated or do 
I want to support stable and simple?

As for the SCCP/MGCP:

That is correct, SCCP does provide more features than MGCP.  However, if 
you're trying to use the redundancy of two Ethernet interfaces you can't 
in SCCP because it wants a MAC address, you can only enter one address in 
CCM.

If you're attaching analog devices, what particular features that SCCP 
provides did you want?  Would you be doing blind transfers with a fax 
machine or credit card machine?  If analog phones, will the phones even 
support the features you want to use?

In SCCP world, the configuration is split between the VG224 and the CCM. 
You have to configure the CCM and in the VG224 configure each analog port 
as well.  In MGCP you enter 3-5 basic commands in the VG224 to point it to 
your CCM and from there all the configurations for the ports are done on 
the CCM.  If you're familiar with the IOS commands, that may be a 
non-issue, but if anything doesn't work, or you need to make changes, you 
now have essentially two separate configurations to administer for every 
line.

So if the features in SCCP override the advantages of redundancy and 
simplicity, then it sounds like SCCP is the way to go.

I think I'm up to $.04 now, or maybe a half-shilling.

JM

From: Lelio Fulgenzi [mailto:lelio at uoguelph.ca] 
Sent: Monday, April 10, 2006 11:55 AM
To: Madziarczyk, Jonathan; Ed Leatherman
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] vg224 vs vg248

why would one use MGCP over SCCP? the chart seems to show that SCCP has 
more features.

--------------------------------------------------------------------------------
Lelio Fulgenzi, B.A.
Network Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Sanity First : Number of days with fewer than
50 messages in my inbox at the end of the day:   buffer overrun
----- Original Message ----- 
From: Madziarczyk, Jonathan 
To: Lelio Fulgenzi ; Ed Leatherman 
Cc: cisco-voip at puck.nether.net 
Sent: Monday, April 10, 2006 12:50 PM
Subject: RE: [cisco-voip] vg224 vs vg248

I use a VG224.  I have currently not been able to find a way to make the 
two Ethernet Interfaces work as redundant interfaces as far as CCM is 
concerned.  If you're using SCCP to CCM you have to specify the MAC 
address so that doesn't work.  If you're using MGCP, you enter the IP 
address of the device.  Using a loopback address will not work.  It looks 
like you might be able to use HSRP, but I've never tried it.

Someone here can speak to the redundant interface issue I'm sure, but just 
know that even though it says it's running IOS, it's not as robust.  Just 
because it has two Ethernet interfaces, it doesn't mean you can use them 
the way you may be wanting to.  Otherwise it's a pretty nice box and is 
simple as all getout to configure in MGCP.

My $.02

JM

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Lelio Fulgenzi
Sent: Monday, April 10, 2006 10:58 AM
To: Ed Leatherman
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] vg224 vs vg248

I like the idea of redundant links. 

--------------------------------------------------------------------------------
Lelio Fulgenzi, B.A.
Network Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Sanity First : Number of days with fewer than
50 messages in my inbox at the end of the day:   buffer overrun
----- Original Message ----- 
From: Ed Leatherman 
To: Lelio Fulgenzi 
Cc: cisco-voip at puck.nether.net 
Sent: Monday, April 10, 2006 11:54 AM
Subject: Re: [cisco-voip] vg224 vs vg248

I have some vg224's on order for a project this summer, the reason we 
chose them instead of the 248's was we had a requirement that the devices 
all needed dual ethernet interfaces (is for a dorm on remote campus). 
248's would have been less expensive due to the port density but we 
couldnt get around the dual interface requirement. Haven't recieved them 
yet so I can't comment on anything else about the 224's. 

We've been using the 248's in our health sciences center, haven't really 
had any problems with them. I'd prefer IOS on them but thats my only real 
complaint. No one has tried to hook up a high speed fax yet though, I 
heard those werent supported unless you turn them down. 
On 4/10/06, Lelio Fulgenzi < lelio at uoguelph.ca> wrote: 
Just wondering what people's opinions are on the two analog gateways 
(vg248 vs vg224). I'm proposing a project that requires 128 ports (perhaps 
more) and we only have experience (mostly good) with the vg248. I'd rather 
keep our inventory similar so I'm leaning towards them rather than 
starting a new with vg224s. 

Also, in the configuration guide, there is an option for IPSEC software. 
Do I need this?
--------------------------------------------------------------------------------
Lelio Fulgenzi, B.A.
Network Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Sanity First : Number of days with fewer than
50 messages in my inbox at the end of the day:   buffer overrun

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-- 
Ed Leatherman
IP Telephony Coordinator
West Virginia University
Telecommunications and Network Operations 

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-- 
Ed Leatherman
IP Telephony Coordinator
West Virginia University
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