If you have a mix of standard phones and agent phones on a single callmanager cluser.. is there a guideline on the pguser association?
Is there any reason why you wouldnt associate every phone in the cluster to the pguser?
Is there any limit on the number of phones associated to pguser?
Are there any best practices for this?
Should also note.. extension mobility is in use as well.
It is CallManger 4.1(3) and ICM 7.1(2)
are you an ATP certified partner? This question requires quite some discussion and a PDI case would help on it(http://www.cisco.com/web/partners/tools/helponline/pdi/index.html).
Staying quite generic it makes a big deal how you associate your phones if those phones are high in number.
All those associations count as a CTI device against the Call Manager, if you are using EM check against configuring EM with IPCC in the installation guide, you will see that the agent will have to login first via EM to then gain the control of the IPPhone via the JTAPI PGUser association and here again a further CTI Device will be added.
There is a device weight calculator to help you size your solution and that would tell you how many phones your setup could handle, how many CTI devices and if with or without EM.