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Disclaimer - this is purely personal opinion and does not reflect any
position of Cisco as a company<br>
<br>
I would use 4.2 with device mobility.<br>
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.<br>
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.<br>
<br>
/Wes<br>
<br>
<br>
Jim McBurnett wrote:
<blockquote
cite="midD2BBAE709B4D874DAC556C7EB9D938FC1B5B97@exchange.TGASolutions.local"
type="cite">
<meta http-equiv="Content-Type" content="text/html; ">
<meta content="MSHTML 6.00.2900.2963" name="GENERATOR">
<div dir="ltr" align="left"><span class="350573112-16082006"><font
color="#0000ff" face="Arial" size="2">Wes,</font></span></div>
<div dir="ltr" align="left"><span class="350573112-16082006"><font
color="#0000ff" face="Arial" size="2">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?</font></span></div>
<div dir="ltr" align="left"><span class="350573112-16082006"></span> </div>
<div dir="ltr" align="left"><span class="350573112-16082006"><font
color="#0000ff" face="Arial" size="2">thanks,</font></span></div>
<div dir="ltr" align="left"><span class="350573112-16082006"><font
color="#0000ff" face="Arial" size="2">jim</font></span></div>
<br>
<div class="OutlookMessageHeader" dir="ltr" align="left" lang="en-us">
<hr tabindex="-1"><font face="Tahoma" size="2"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:cisco-voip-bounces@puck.nether.net">cisco-voip-bounces@puck.nether.net</a>
[<a class="moz-txt-link-freetext" href="mailto:cisco-voip-bounces@puck.nether.net">mailto:cisco-voip-bounces@puck.nether.net</a>] <b>On Behalf Of </b>Wes
Sisk<br>
<b>Sent:</b> Wednesday, August 16, 2006 8:22 AM<br>
<b>To:</b> Voll, Scott<br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</a><br>
<b>Subject:</b> Re: [cisco-voip] CER<br>
</font><br>
</div>
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.
<div><br class="khtml-block-placeholder">
</div>
<div>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</div>
<div><a
href="http://www.cisco.com/en/US/customer/products/sw/voicesw/ps556/products_administration_guide_chapter09186a008055af42.html">http://www.cisco.com/en/US/customer/products/sw/voicesw/ps556/products_administration_guide_chapter09186a008055af42.html</a></div>
<div><br class="khtml-block-placeholder">
</div>
<div>/Wes</div>
<div><br>
<div>
<div>On Aug 15, 2006, at 5:50 PM, Voll, Scott wrote:</div>
<br class="Apple-interchange-newline">
<div class="Section1">
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">I don’t know much about
CER but I have a problem and I’m wondering if that is my answer.<O:P></O:P></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><O:P></O:P></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">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.<O:P></O:P></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><O:P></O:P></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">How does CER take care of
this issue?<O:P></O:P></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><O:P></O:P></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Scott<O:P></O:P></span></font></p>
</div>
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<br>
</div>
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