[cisco-voip] CER

[Jim McBurnett]

Thanks Wes,
Just what I was wanting to know..
 
Jim

________________________________

From: Wes Sisk [mailto:wsisk at cisco.com] 
Sent: Wednesday, August 16, 2006 10:29 AM
To: Jim McBurnett
Cc: Voll, Scott; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] CER


Disclaimer - this is purely personal opinion and does not reflect any
position of Cisco as a company

I would use 4.2 with device mobility.
1. CER has to do a discovery to find the phone in the new location.
Depending on how often you have the discovery run, you still have a
window of opportunity where a phone could move and reach the wrong 911
operator.  With device mobility, as soon as the phone registers it gets
a new CSS.
2. CTI interface to CM is still prone to failure.  CTI or CER could go
down and all 911 calls would route to a default 911 operator.  With
device mobility the only failure is if the GW or CM goes down. If those
are down you cannot complete a call anyway.

/Wes


Jim McBurnett wrote: 

	Wes,
	then if you have a stable environment and IP addresses are
assigned in a city by location would you reccomend 4.2 CSS vs CER?
	 
	thanks,
	jim

________________________________

	From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Wes Sisk
	Sent: Wednesday, August 16, 2006 8:22 AM
	To: Voll, Scott
	Cc: cisco-voip at puck.nether.net
	Subject: Re: [cisco-voip] CER
	
	
	Yes, CER would address this by discovering which switch port the
phone was plugged into and then assigning a 911 ELIN based on the
administratively assigned location/ELIN of that switch. 

	You can accomplish similar behavior in CM 4.2 with device
mobility where the device CSS changes based on the IP of the registering
device
	
http://www.cisco.com/en/US/customer/products/sw/voicesw/ps556/products_a
dministration_guide_chapter09186a008055af42.html

	/Wes

	On Aug 15, 2006, at 5:50 PM, Voll, Scott wrote:


	I don't know much about CER but I have a problem and I'm
wondering if that is my answer.

	

	I have multiple sites and I have now seen as of today people
moving from one site to another site and I was not informed.  Which
means due to CSS they would be call out the wrong VGW for 911.

	

	How does CER take care of this issue?

	

	Scott

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