Control Sip And Rtp Behaviour In Dual Mode - Cisco 7800 Series Administration Manual

Cisco IP Phone Installation

Control SIP and RTP Behaviour in Dual Mode

You can control SIP and RTP parameters with SIP IP Preference and SDP IP Preference fields when phone
is in dual mode.
SIP IP Preference parameter defines which IP address phone tries first when it is in dual mode.
Table 12: SIP IP Preference and IP Mode
IP Mode
Dual
Mode
Dual
Mode
Dual
Mode
Dual
Mode
IPv4
Only
IPv6
Only
SDP IP Preference - ALTC helps peers in dual-mode negotiate RTP address family.
SIP IP Address List from DNS, Priority, Result
Preference
P1 - First Priority Address
P2 - Second Priority Address
IPv4 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 1.1.1.1
first.
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.
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
Control SIP and RTP Behaviour in Dual Mode
Failover Sequence
1.1.1.1 ->2009:1:1:1:1 ->
2.2.2.2 -> 2009:2:2:2:2
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
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