Provide telephony instrument services including, but not limited to, provisioning telephones, configuring and connecting VoIP telephones, keying secure equipment, changing usernames, enabling and disa bling extension mobility, and activating and deactivating telephone features. Onsite : If this position is listed as onsite, work will primarily be performed at a Booz Allen office or customer facility, where employees will collaborate directly with colleagues and customers as required by the role.