
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding the Phone Startup Process
For more information about how the phone interacts with the TFTP server, see the Cisco Unified Communications Manager System Guide, Cisco TFTP.
Understanding the Phone Startup Process
When connecting to the VoIP network, the Cisco Unified IP Phone goes through a standard startup process, as described in Table
Table | Cisco Unified IP Phone Startup Process |
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No. | Process |
| Description | Related Topics |
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1. | Obtaining Power from the | If a phone is not using external power, the switch | See Providing Power to the | |
| Switch. |
| provides | Phone, page |
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| attached to the phone. | See Resolving Startup Problems, |
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2. | Loading the Stored | The Cisco Unified IP Phone has | See Resolving Startup Problems, | |
| Phone Image. | memory in which it stores firmware images and | page | |
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| bootstrap loader that loads a phone image stored in flash |
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| memory. Using this image, the phone initializes its |
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| software and hardware. |
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3. | Configuring VLAN. | If the Cisco Unified IP Phone is connected to a Cisco | See Network Configuration | |
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| switch, the switch next informs the phone of the voice | Menu, page |
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| VLAN defined on the switch port. The phone needs to | See Resolving Startup Problems, |
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| know its VLAN membership before it can proceed with | |
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| the DHCP request for an IP address. |
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4. | Obtaining an IP Address. | If the Cisco Unified IP Phone is using DHCP to obtain an | See Network Configuration | |
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| IP address, the phone queries the DHCP server to obtain | Menu, page |
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| one. If you are not using DHCP in your network, you | See Resolving Startup Problems, |
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| must assign static IP addresses to each phone locally. | |
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5. | Accessing a TFTP Server. | In addition to assigning an IP address, the DHCP server | See Network Configuration | |
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| directs the Cisco Unified IP Phone to a TFTP Server. If | Menu, page |
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| the phone has a statically defined IP address, you must | See Resolving Startup Problems, |
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| configure the TFTP server locally on the phone; the | |
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| phone then contacts the TFTP server directly. | |
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| Note You can also assign an alternative TFTP server to |
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| use instead of the one assigned by DHCP. |
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6. | Requesting the CTL file. | The TFTP server stores the CTL file. This file also | See the Cisco Unified | |
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| contains the certificates necessary for establishing a | Communications Manager |
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| secure connection between the phone and Cisco | Security Guide, Configuring the |
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| Unified CM. | Cisco CTL Client. |
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Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)
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