[cisco-voip] Extension Mobility Service URL

[Ryan Ratliff]

DNS round-robin isn't advisable since EM should only process logins on a max of 2 nodes, and you're better off keeping one of them handling requests at a time.

The SRND has a section dedicated to this for EM.  Off the top of my head SLB is the feature we recommend.
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/8x/cmapps.html#wp1189079

-Ryan

On Jul 22, 2011, at 3:53 PM, Wellnitz, Erick A. wrote:

Only problem with that is every other request will fail if one of the EM nodes is down.  DNS isn’t intelligent enough to know when a server is down.
 
From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of ROZA, Ariel
Sent: Friday, July 22, 2011 2:49 PM
To: stephen.welsh at unifiedfx.com; Bill Riley
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Extension Mobility Service URL
 
Another, simpler, way is to us DNS round robin, setting the EM URL to a hostname instead of an IP address.
The DNS Server should then have two A records with the same name pointing to both subscribers´s IP addresses.
 
Ariel.
From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of stephen.welsh at unifiedfx.com
Sent: viernes, 22 de julio de 2011 09:26 a.m.
To: Bill Riley
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Extension Mobility Service URL
 
I've seen some people create two Extension Mobility Service URL's and subscribed both services to all phones i.e.:
 
Primary Login Service
Backup Login Service
 
Cuts on the cost/complexity of a load balancer (the best solution), but does require the user to engage the back-up service manually.
 
Thanks
 
Stephen
 
On 22 Jul 2011, at 13:11, Bill Riley wrote:
 

You need to use a hardware load balancer and point the URL to the load balancer IP.
 
From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of cips
Sent: Friday, July 22, 2011 6:43 AM
To: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Extension Mobility Service URL
 
Or you can use a single-sign-on application like ALM which does not rely on the service URL but verifies the cm’s for sending the logon logoff messages.
 
From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Mike King
Sent: donderdag 21 juli 2011 23:07
To: Cisco VoIPoE List
Subject: [cisco-voip] Extension Mobility Service URL
 
We had to bring down a Subscriber last night, and had no issues other than extension mobility.  The services URL specifically referenced this Subscriber.
Since we have a few subscribers, is there a way to make this a little more fault tolerant?  I notice most of the other URL's (Corporate Directory) all start with Application/Cisco instead ofhttp://IP address of server.
 
The next time I have a similar issue, and I need to change that URL, are they're any services I need to restart?  Reset phones?  Will it just work?
 
Mike
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