You administer a UCM network of 500 IP phones
You need to add 50 new IP phones to your company’s UCM network before the end of the workday. Which of
the following does Cisco recommend you do? (Select the best answer.)
A.
Add a second UCM server to the cluster.
B.
Add the phones by using the BAT.
C.
Enable auto-registration in UCM.
D.
Provision the IP phones manually in UCM.
Explanation:
Cisco recommends that you enable auto-registration in Cisco Unified Communications Manager (UCM) to add
fewer than 100 new IP phones to a UCM network. There are three ways to add IP phones to a UCM database:
by configuring auto-registration, by using the Bulk Administration Tool (BAT), and by manually provisioning the
IP phones in the UCM administrative graphical user interface (GUI). Both auto-registration and the BAT provide
a means of adding many phones to the database simultaneously. However, Cisco does not recommend using
the BAT if you need to add fewer than 100 IP phones.
Auto-registration enables UCM to automatically add new IP phones to the UCM database as the IP phones are
connected to the network. When a new IP phone is connected to the network, UCM will automatically assign an
unused directory number (dn) to the IP phone from a pool of available dn numbers.
Auto-registration is a security risk because rogue devices can be connected to the network and registered with
UCM by using auto-registration. In addition, you could accidentally register a valid IP phone with a dn from the
wrong dn pool if you leave auto-registration enabled after you have completed an auto-registration process.
Therefore, Cisco recommends that you enable auto-registration only for short periods of time, such as when
you need to add fewer than 100 IP phones to the network. In this scenario, you want to add 50 new IP phones
to your company’s UCM network before the end of the workday. Because of the time limitation and the small
number of IP phones, enabling auto-registration would require the least amount of administrative effort.
You do not need to provision the IP phones manually in UCM. Although you can manually add an IP phone to a
UCM database, adding 50 new IP phones by using manual provisioning would require more administrative
effort than by using auto-registration or the BAT. When you are manually provisioning an IP phone in UCM, you
must fill in the MAC Address field, the Device Pool field, the Phone Button Template field, and the Device
Security Profile field. In this scenario, you want to add 50 new IP phones to your company’s UCM network
before the end of the workday. Because of the time limitation and the number of IP phones, enabling autoregistration would require the least amount of administrative effort. Therefore, you should not manually
provision the IP phones. You do not need to add a second UCM server to the cluster. UCM supports a
maximum of 7,500 devices as a standalone server and a maximum of 30,000 IP phones per UCM cluster. In
this scenario, you administer a network of 500 IP phones. In addition, you are adding only 50 new IP phones,
which brings the total number of IP phones to 550.
You do not need to add the phones by using the BAT. The BAT enables a UCM administrator to add or modify
multiple IP phones at once. However, Cisco recommends that you use the BAT to add 100 or more new IP
phones to a UCM network. In this scenario, using the BAT would require more administrative effort than using
auto-registration because the BAT requires you to provide Media Access Control (MAC) addresses for the IP
phones that are being added. Auto-registration does not require you to provide MAC addresses.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/8_0_2/ccmsys/accm-802-cm/
a02autor.html#wp1020237