Cisco Ip Phone 8800 Series Multiplatform Phones Administration Guide - Cisco 8851 Administration Manual

SIP and NAT Configuration
IP Mode
Dual Mode
Dual Mode
IPv4 Only
IPv6 Only
SDP IP Preference - ALTC helps peers in dual-mode negotiate RTP address family.
Procedure
Step 1 On the phone web page, select Admin Login > advanced > Voice > SIP.
Step 2
In the SIP Parameters section, select IPv4 or IPv6 in the SIP IP Preference field.
Step 3 In the RTP Parameters section, select IPv4 or IPv6 in the SDP IP Preference field.
For details, see SDP IP Preference in

Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide

58
SIP IP Preference Address List from DNS,
Priority, Result
P1 - First Priority Address
P2 - Second Priority
Address
IPv4 P1- 2009:1:1:1::1
P2 - 2.2.2.2, 2009:2:2:2::2
Result: Phone will send
the SIP messages to
2009:1:1:1::1 first.
IPv6 P1- 2009:1:1:1::1
P2 - 2.2.2.2, 2009:2:2:2::2
Result: Phone will send
the SIP messages to
1.1.1.1 first.
IPv4 P1 - 1.1.1.1, 2009:1:1:1::1
or P2 - 2.2.2.2, 2009:2:2:2::2
IPv6 Result: Phone will send
the SIP messages to
1.1.1.1 first.
IPv4 P1 - 1.1.1.1, 2009:1:1:1::1
or P2 - 2.2.2.2, 2009:2:2:2::2
IPv6 Result: Phone will send
the SIP messages to
2009:1:1:1::1 first.
RTP Parameters, on page
Failover Sequence
2009:1:1:1:1 -> 2.2.2.2 ->
2009:2:2:2:2
2009:1:1:1:1 ->
2009:2:2:2:2
->2.2.2.2
1.1.1.1 -> 2.2.2.2
2009:1:1:1:1 ->
2009:2:2:2::2
226.