Cisco 8851 Administration Guide

Failover SequenceAddress List from DNS, Priority, Result
P1 - First Priority Address
P2 - Second Priority Address
SIP IP
Preference
IP Mode
2009:1:1:1:1 ->
1.1.1.1 -> 2009:2:2:2:2 ->
2.2.2.2
P1- 1.1.1.1, 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.
IPv6Dual
Mode
2009:1:1:1:1 -> 2.2.2.2 ->
2009:2:2:2:2
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.
IPv4Dual
Mode
2009:1:1:1:1 -> 2009:2:2:2:2
->2.2.2.2
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.
IPv6Dual
Mode
1.1.1.1 -> 2.2.2.2P1 - 1.1.1.1, 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
or
IPv6
IPv4
Only
2009:1:1:1:1 ->
2009:2:2:2::2
P1 - 1.1.1.1, 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.
IPv4
or
IPv6
IPv6
Only
SDP IP Preference - ALTC helps peers in dual-mode negotiate RTP address family.
Before you begin
Access the phone administration web page. See Access the Phone Web Page, on page 88.
Procedure
Step 1 Select 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 RTP Parameters, on page 278.
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
66
Cisco IP Phone Installation
Control SIP and RTP Behaviour in Dual Mode

Cisco 8851 Specifications

General

Brand	Cisco
Model	8851
Category	IP Phone
Language	English