I'm guessing that the service you are referring to is the 'Personal Phone Book' rather than anything else. Services are flexible and it may be something very custom. First thing would be to find out what the service is:
Go to the config page for one of the phones in CCMAdmin, and then on the drop-down 'related links' menu on the top right, select 'Subscribe/Unsubscribe' services. Have a look what services are subscribed, and note them down. If there are services listed, go next to Device/Device Settings/Phone Services and find the services the phones are subscribed to - post up their URLs here.
If there are no services subscibed, have a look at the Services URL on the phone configuration page. Post that up here.
With those bits of information we'll hopefully be able to help you further..
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The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.