McDewey

Device Mobility Restrictions Table 8: Device Mobility Restrictions Description Restriction The device mobility feature depends on the IPv4 address or IPv6 address of the device that registers with Unified Communications Manager. • The phone must have a dynamic IPv4 address or IPv6 address to use the device mobility. • If the device is assigned an IP address by using network address translation (NAT) or port address translation (PAT), the IP address that is provided during registration may not match the actual IP address of the device. • If the Cisco IP phone supports IPv4-Only Stack or IPv6-Only Stack, then the phone gets re-associated either with IPv4 or IPv6 Device Mobility Information, based on the IP addressing mode preference defined. For example, when a phone is defined with IPv6 preference but has no matching Device Mobility Information (IPv6 subnet and mask size), then it is associated with IPv4. When you add matching IPv6 Device Mobility Information, then the phone gets re-associated with IPv6 Device Mobility Information. IP Address Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 53 Remote Worker Features Device Mobility Restrictions