[cisco-voip] Multiple subscriber phone load balancing - interesting

[FrogOnDSCP46EF]

Holiday today, just sitting at home on the couch with a glass of red wine.
I was doing nothing so I started flocking through CCM 6x parameters.

A parameter which drew my attention was "Maximum number of register device"
in call manager service parameter.

I am trying to figure out the best way to load balance IP phone registration
to all subscribers.

Sales department has 1500 IP phones.

I have 3 subscribers - Sub1, sub2, sub3
Call manager group = sales_cm-group = Sub1, Sub2, Sub3

Device pool for Sales department:   "DP_Sales" = sales_cm-group
(sub1,sub2,sub3)

If I have set 'max number of register device' = 400 in each subscriber's
service parameter.
How would it behave?

Just talking to myself:

1. First 500 phones will register to Sub1.
2. Then next lot, 501 to 1000 phones will register to Sub2. This is bcoz
Sub1 has reached its limit of 500. So Phone#501 will try to register to
second subscriber #sub2 (hunting through list).

3. Then following Sub3 will register 1001 to 1500 coz sub1 and sub2 has
reached their limits.

If it works, this could be a good way to do load-balancing. Am I right?

-frog


*Maximum Number of Registered Devices:* [image: Required Field]  This
parameter specifies the maximum number of devices that can register with
Cisco CallManager and is used to limit the overall resource demand. Devices
that count toward this limit include: Annunciator devices, H.323
gatekeepers, H.323 phones, H.323 gateways, ICT trunks (gatekeeper or
non-gatekeeper-controlled), MGCP CAS trunks, MGCP gateways, MGCP FXS ports
(analog ports), MGCP FXO ports, MGCP T1/E1 PRI, media termination points
(hardware or software), transcoders, Music on Hold servers (not MOH audio
sources), SIP trunks, IP phones, conference bridge devices (hardware or
software), legacy Skinny Gateway Control Protocol devices like Cisco Analog
Access, and video conference bridges (IP/VC 3540 configured with Skinny
Client Control Protocol [SCCP] port). The following devices are NOT counted
toward this limit: line appearances (directory numbers), route lists and
built in bridges.      This is a required field.      Default:  5000
  Minimum:  5000    Maximum:  15000

-- 
Smile, you'll save someone else's day!
Frog
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