Procedure
Step 1
On the phone web page, select
Admin Login
>
Advanced
>
Voice
>
Systems
.
Step 2
In the
Optional Network Configuration
section, enter IPv4 or IPv6 address in the
Primary NTP Server
and
Secondary NTP Server
.
Step 3
Click
Submit All Changes
.
Configure the RTP Parameters
Procedure
Step 1
In the phone web user interface, navigate to
Admin Login
>
advanced
>
Voice
>
SIP
.
Step 2
In the
RTP Parameters
section, set the Real-Time Transport Protocol (RTP) parameter values as described
in
RTP Parameters, on page 226
.
Step 3
Click
Submit All Changes
.
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
Failover Sequence
Address List from DNS,
Priority, Result
P1 - First Priority Address
P2 - Second Priority
Address
SIP IP Preference
IP Mode
1.1.1.1 ->2009:1:1:1:1 ->
2.2.2.2 -> 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
1.1.1.1 first.
IPv4
Dual 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.
IPv6
Dual Mode
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
57
SIP and NAT Configuration
Summary of Contents for 8851
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