SIPTimer--688IT编程网

SIP Timer

The SIP Timer feature allows the user to configure a number of SIP timers that were hard-coded in the previous releases of Cisco IOS XR software. The ability to configure SIP timers enables users to

improve the interoperability and performance of their devices and network environment. Feature History for SIP Timer Functions

Contents

This module contains the following sections:

•Information About SIP Timer, page 1•How to Configure SIP Timer, page 3•

Related Documents, page 5

Information About SIP Timer

The SIP timer feature allows the user to configure some of the SIP timers that were hardcoded to default values in the previous releases of Cisco IOS XR software. In the previous releases, the SBC used the default SIP timer values recommended by RFC 3261. See Table 8.

Release

Modification

Release 3.4.1This feature was introduced on the Cisco XR 12000Series Router.

T able 8

Default Values of the Timers

Timer Value Meaning T1500 ms default RTT Estimate

T2 4 s The maximum retransmit interval for non-INVITE requests and INVITE responses

T4 5 s Maximum duration a message will remain in the network

Timer A initially T1INVITE request retransmit interval, for UDP only Timer B

64* T1

INVITE transaction timeout timer

SIP Timer Information About SIP Timer

The SBC allows the user to modify T1, T2 and Timer D, using: udp-first-retransmit-interval,

udp-max-retransmit-interval and udp-response-linger-period accordingly. Another timer also

introduced in this release is invite-timeout parameter, which lets the user choose how long SBC should wait for the remote SIP endpoint to respond to the SBC's outgoing INVITE or Timer B in an outgoing transaction.

In addition to the SIP protocol-level timers, SBC also allows modification of transport-related timers: tcp-connect-timeout (how long TCP SYN will wait for the reply); tcp-idle-timeout (how long TCP connection should stay active while idle), and tls-idle-timeout (how long TLS connection should stay active while idle). Although these timers are transport-level values, IOS-XR supports these timers in SIP only, but not in H.323, nor H.248.

Note The incorrect configuration of the SIP timer values may lead to unexpected behavior in certain cases.

Timer C> 3 min proxy INVITE transaction timeout

Timer D> 32 s for UDP

timeout on t2 timer

0 s for TCP/SCTP

Wait time for response retransmits

Timer E initially T1non-INVITE request retransmit interval, UDP

only

Timer F64* T1non-INVITE transaction timeout timer

Timer G initially T1INVITE response retransmit interval

Timer H64* T1Wait time for ACK receipt

Timer I T4 for UDP

0 s for TCP/SCTP

Wait time for ACK retransmits

Timer J64* T1 for UDP

0 s for TCP/SCTP

Wait time for non-INVITE request retransmits

Timer K T4 for UDP

0 s for TCP/SCTP

Wait time for response retransmits T able8Default Values of the Timers (continued)

Timer Value Meaning

SIP Timer

How to Configure SIP Timer

This section contains the steps for configuring SIP timers.

Configuring SIP Timer

SUMMARY STEPS

2.sbc service-name

3.sbe

4.sip timer

7.tls-idle-timeout interval

8.invite-timeout interval

9.udp-first-retransmit-interval interval

10.udp-max-retransmit-interval interval

11.udp-response-linger-period interval

12mit

14.show services sbc service-name sbe sip timers

DETAILED STEPS

Command or Action Purpose

Step1configure

Example:

RP/0/0/CPU0:router# configure

Enables global configuration mode.

Step2sbc service-name

Example:

RP/0/0/CPU0:router(config)# sbc mysbc Enters the mode of an SBC service.

•Use the service-name argument to define the name of the service.

Step3sbe

Example:

RP/0/0/CPU0:router(config-sbc)#sbe Enters the mode of the signaling border element (SBE) function of the SBC.

SIP Timer How to Configure SIP Timer

Step4sip timer

Example:

RP/0/0/CPU0:router(config-sbc-sbe)# sip timer

Enters the mode of the SIP timer function of the SBC.

Step5tcp-connect-timeout interval

Example: