Cisco 8800 Series Administration Manual page 82

Control SIP and RTP Behaviour in Dual Mode
IP Mode
Dual
Mode
Dual
Mode
Dual
Mode
IPv4
Only
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
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
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
66
SIP IP Address List from DNS, Priority, Result
Preference
P1 - First Priority Address
P2 - Second Priority Address
IPv6 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 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
Access the Phone Web Page, on page
278.
Cisco IP Phone Installation
Failover Sequence
2009:1:1:1:1 ->
1.1.1.1 -> 2009:2:2:2:2 ->
2.2.2.2
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
88.