If there is more than one phone in an office, it is easier to set specific ringtones for every individual. Follow these instruction to set up a ringtone:
This page consists of tutorials for the usage of IP phone model 7841. What are the functions of the keys on the phone? How can I view the calls I have missed? How to transfer a call? How can I set a ringtone on my phone? How to find someone on the directory?