Hi James,
Based on your description, you want to add additional pool, and you want to know how to manage this environment, in my opinion, you could use SFB control panel to manage SFB, around 80-90% of all the administrative tasks can be managed with this graphical
interface.
The following document indicates the steps to add additional domain in your topology
https://exchangequery.com/2015/04/04/steps-to-add-additional-sip-domains-in-already-existing-lync-2013-deployment/
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make
sure that you completely understand the risk before retrieving any suggestions from the above link.
For the trusted application pool, based on my research, there is no limitation when configure with SFB FE pool, please refer to the following article to configure a new trusted application server, it’s same to SFB 2015
https://technet.microsoft.com/en-us/library/gg617964%28v=ocs.15%29.aspx
https://technet.microsoft.com/en-us/library/gg425804.aspx
Regards,
Alice Wang
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