Contents

• Expires Timer Reset on Receiving or Sending SIP 183 Message
• Finding Feature Information
• Prerequisites for Expires Timer Reset on Receiving or Sending SIP 183 Message
• How to Configure Expires Timer Reset on Receiving or Sending SIP 183 Message
• Configuring Reset of Expires Timer Globally
• Configuring Reset of Expires Timer at the Dial-Peer Level
• Feature Information for Configuring Support for Expires Timer Reset on Receiving or Sending SIP 183 Message

Expires Timer Reset on Receiving or Sending SIP 183 Message

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This feature enables support for resetting the Expires timer when receiving or sending SIP 183 messages on Cisco Unified Communications Manager Express (Cisco Unified CME), a Cisco IOS voice gateway, or a Cisco Unified Border Element (Cisco UBE). When the terminating device lacks answer supervision or does not send the required SIP 200 OK message within the timer expiry, you can enable this feature to send periodic SIP 183 messages to reset the Expires timer and preserve the call until final response. This feature can be enabled globally or on a specific dial peer. Additionally, you can configure this feature based on the presence or absence of Session Description Protocol (SDP).

For details about enabling this feature, see the reset timer expires and voice-class sip reset timer expires commands in the Cisco IOS Voice Command Reference.

• Finding Feature Information
• Prerequisites for Expires Timer Reset on Receiving or Sending SIP 183 Message
• How to Configure Expires Timer Reset on Receiving or Sending SIP 183 Message
• Feature Information for Configuring Support for Expires Timer Reset on Receiving or Sending SIP 183 Message

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Prerequisites for Expires Timer Reset on Receiving or Sending SIP 183 Message

Before configuring support for Expires timer reset for SIP 183 on Cisco IOS SIP time-division multiplexing (TDM) gateways, Cisco UBEs, or Cisco Unified CME, verify the SIP configuration within the VoIP network for the appropriate originating and terminating gateways as described in the Cisco IOS SIP Configuration Guide.

Cisco Unified Border Element

• Cisco IOS Release 15.0(1)XA or a later release must be installed and running on your Cisco Unified Border Element.

Cisco Unified Border Element (Enterprise)

• Cisco IOS XE Release 3.1S or a later release must be installed and running on your Cisco ASR 1000 Series Router.

How to Configure Expires Timer Reset on Receiving or Sending SIP 183 Message

To configure the Support for Expires Timer Reset on Receiving or Sending SIP 183 Message feature, complete the tasks in this section. You can enable this feature globally, using the reset timer expires command in voice service SIP configuration mode, or on a specific dial-peer using the voice-class sip reset timer expires command in dial peer voice configuration mode.

• Configuring Reset of Expires Timer Globally
• Configuring Reset of Expires Timer at the Dial-Peer Level

Configuring Reset of Expires Timer Globally

Perform this task to enable resetting of the Expires timer at the global level in SIP configuration (conf-serv-sip) mode.

SUMMARY STEPS

1.    enable


2.    configure terminal


3.    voice service voip


4.    sip


5.    reset timer expires 183


6.    exit

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	voice service voip Example: Router(config)# voice service voip	Enters voice service VoIP configuration mode.
Step 4	sip Example: Router(conf-voi-serv)# sip	Enters SIP configuration mode.
Step 5	reset timer expires 183 Example: Router(conf-serv-sip)# reset timer expires 183	Enables resetting of the Expires timer upon receipt of SIP 183 messages globally.
Step 6	exit Example: Router(conf-serv-sip)# exit	Exits the current mode.

Configuring Reset of Expires Timer at the Dial-Peer Level

Perform this task to enable resetting of the Expires timer at the dial-peer level in dial peer voice configuration (config-dial-peer) mode.

SUMMARY STEPS

1.    enable


2.    configure terminal


3.    dial-peer voice tag voip


4.    voice-class sip reset timer expires 183


5.    exit

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	dial-peer voice tag voip Example: Router(config)# dial-peer voice 2 voip	Enters dial peer VoIP configuration mode.
Step 4	voice-class sip reset timer expires 183 Example: Router(config-dial-peer)# voice-class sip reset timer expires 183	Enables resetting of the Expires timer upon receipt of SIP 183 messages on a specific dial peer.
Step 5	exit Example: Router(config-dial-peer)# exit	Exits the current mode.

Feature Information for Configuring Support for Expires Timer Reset on Receiving or Sending SIP 183 Message

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Feature History Table entry for the Cisco Unified Border Element.

Table 1 Feature Information for Support for Expires Timer Reset on Receiving or Sending SIP 183 Message

Feature Name	Releases	Feature Information
Support for Expires Timer Reset on Receiving or Sending SIP 183 Message	15.0(1)XA 15.1(1)T	This feature enables support for resetting the Expires timer upon receipt of SIP 183 messages on Cisco Unified Communications Manager Express (Cisco Unified CME), a Cisco IOS voice gateway, or a Cisco Unified Border Element (Cisco UBE). The following commands were introduced or modified: reset timer expiresand voice-class sip reset timer expires.

Feature History Table entry for the Cisco Unified Border Element (Enterprise) .

Table 2 Feature Information for Support for Expires Timer Reset on Receiving or Sending SIP 183 Message

Feature Name	Releases	Feature Information
Support for Expires Timer Reset on Receiving or Sending SIP 183 Message	Cisco IOS XE Release 3.1S	This feature enables support for resetting the Expires timer upon receipt of SIP 183 messages on Cisco Unified Communications Manager Express (Cisco Unified CME), a Cisco IOS voice gateway, or a Cisco Unified Border Element (Cisco UBE). The following commands were introduced or modified: reset timer expiresand voice-class sip reset timer expires.