Cisco 6941 Administration Guide - Page 44

Understanding Interactions with Other Cisco Unified IP Telephony Products Chapter Understanding How the Cisco Unified IP Phone Interacts with Cisco Unified CM Cisco Unified CM is an open and industry-standard call processing system. Cisco Unified CM software sets up and tears down calls between phones, integrating traditional PBX functionality with the corporate IP network. Cisco Unified CM manages the components of the IP telephony system-the phones, the access gateways, and the resources necessary for features such as call conferencing and route planning. Cisco Unified CM also provides: • Firmware for phones • Configuration file via TFTP service • Authentication and encryption (if configured for the telephony system) • Phone registration • Call preservation, so that a media session continues if signaling is lost between the primary CM and a phone For information about configuring Cisco Unified CM to work with the IP devices described in this chapter, go to the Cisco Unified IP Phone Configuration chapter in the Cisco Communications Manager Administration Guide. For an overview of security functionality for the Cisco Unified IP Phone, see the "Understanding Security Features for Cisco Unified IP Phones" section on page 1-14. Note If the Cisco Unified IP Phone model that you want to configure does not appear in the Phone Type drop-down list in Cisco Unified CM Administration, go to the following URL and install the latest support patch for your version of Cisco Unified CM:  http://www.cisco.com/cisco/software/navigator.html?mdfid=278875240&i=rp  For more information, refer to "Software Upgrades" chapter in the Cisco Unified Communications Operating System Administration Guide. Related Topic • Telephony Features Available for the Cisco Unified IP Phone, page 5-1 Understanding How the Cisco Unified IP Phone Interacts with the VLAN The Cisco Unified IP Phone 6921, 6941, and 6961 have an internal Ethernet switch, enabling forwarding of packets to the phone, and to the access port and the network port on the back of the phone. If a computer is connected to the access port, the computer and the phone share the same physical link to the switch and share the same port on the switch. This shared physical link has the following implications for the VLAN configuration on the network: • The current VLANs might be configured on an IP subnet basis. However, additional IP addresses might not be available to assign the phone to the same subnet as other devices connected to the same port. • Data traffic present on the VLAN supporting phones might reduce the quality of Voice-over-IP traffic. • Network security may indicate a need to isolate the VLAN voice traffic from the VLAN data traffic. Cisco Unified IP Phone 6921, 6941, 6945, and 6961 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP) 2-2 OL-23769-01