Cisco 8861 Guide

DescriptionParameter
Allows you to specify whether an RTP session starts
before or after an ACK is received from the calling
party.
Perform one of the following:
• In the phone configuration file with
XML(cfg.xml), enter a string in this format:
<RTP_Before_ACK
ua="na">No</RTP_Before_ACK>
• In the phone web page select:
• Yes: An RTP session doesn't await an ACK,
but starts after a 200 OK message is sent.
• No: An RTP session doesn't start until an
ACK is received from the calling party.
Allowed values: Yes or No
Default: No
RTP Before ACK
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 74: SIP IP Preference and IP Mode
Failover SequenceAddress 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.
IPv4Dual
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
Cisco IP Phone 8800 Series Multiplatform Phone Administration Guide for Release 11.3(1) and Later
358
Cisco IP Phone Installation
Control SIP and RTP Behaviour in Dual Mode

Cisco 8861 Specifications

General

Brand	Cisco
Model	8861
Category	IP Phone
Language	English