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102-3
Cisco Unified Communications Manager Administration Guide
OL-18611-01
Chapter 102 Common Device Configuration
Common Device Configuration Settings
IP Addressing Mode
Preference for
Signaling
For dual-stack phones, which support both IPv4 and IPv6 addresses, choose
the version of IP address that the phone prefers to establish a connection to
Cisco Unified Communications Manager during a signaling event. For
dual-stack SIP trunks, choose the version of IP address that the SIP trunk
uses to connect to the peer device for signaling events.
From the drop-down list box, choose one of the following options:
• IPv4—The dual-stack device prefers to establish a connection via an
IPv4 address during a signaling event.
• IPv6—The dual-stack device prefers to establish a connection via an
IPv6 address during a signaling event.
• Use System Default—The configuration for the enterprise parameter, IP
Addressing Mode Preference for Signaling, applies.
Allow
Auto-Configuration for
Phones
This drop-down list box supports IPv6 for dual-stack Cisco Unified IP
Phones that run SCCP. From the drop-down list box, choose one of the
following options:
• On—Depending on how the M bit is set via stateless address
autoconfiguration on the router, the phone is allowed to use the IPv6
Network ID that is advertised in the Router Advertisements (RAs) to
autoconfigure its IPv6 address.
Phones also require a TFTP server address to register with Cisco Unified
Communications Manager. You can manually configure the TFTP
server address via the interface on the phone, or you can obtain it from
a DHCPv6 server.
Tip To indicate to the phone that it needs to use the DHCPv6 server to
obtain other information, ensure that the O bit is set via stateless
address autoconfiguration on the router.
• Off—The phone obtains its IPv6 address and TFTP server address from
the DHCPv6 server.
• Default—To use the configuration for the Allow Auto-Configuration for
Phones enterprise parameter, choose this option.
Although Cisco Unified Communications Manager does not use this
configuration, the TFTP file that the phone obtains includes this information.
Table 102-1 Common Device Configuration Settings (continued)
Field Description