Table Of Contents

Selective Filtering of Outgoing Provisional Response on the Cisco Unified Border Element

Prerequisites

Restrictions

How to Configure Selective Filtering of Outgoing Provisional Response on the Cisco Unified Border Element

Selective Filtering of Outgoing Provisional Response on the Cisco Unified Border Element

This feature adds support on the Cisco Unified Border Element (Cisco UBE) platforms for selective filtering of outgoing provisional responses, including "180-Alerting" and "183-Session In Progress" responses. Selective filtering can be further based on the availability of media information in the received provisional response.

Next Generation Network (NGN) restricts the UNI from sending a 183 response with Session Description Protocol (SDP) toward the NGN network. Cisco Unified Communications Manager always sends a 183 response with SDP responses. It is necessary for the Cisco UBE to block these responses to allow Cisco Unified Communications Manager to interwork within the Next Generation network.

Prerequisites

Cisco Unified Border Element

•Cisco IOS Release 12.4(22)YB 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.

Restrictions

•Blocking 180 and183 responses with or without the SDP requirement is to block 183 with SDP only.

How to Configure Selective Filtering of Outgoing Provisional Response on the Cisco Unified Border Element

To enable Selective Filtering of Outgoing Provisional Response on the Cisco UBE, perform the steps in this section. This section contains the following subsections:

•Configuring Selective Filtering of Outgoing Provisional Response on the Cisco UBE at the Global Level

•Configuring Selective Filtering of Outgoing Provisional Response on the Cisco UBE at the Dial Peer Level

Configuring Selective Filtering of Outgoing Provisional Response on the Cisco UBE at the Global Level

To configure Selective Filtering of Outgoing Provisional Response on the Cisco UBE at the global level, perform the steps in this section:

SUMMARY STEPS

1. enable

2. configure terminal

3. voice service voip

4. sip

5. block 183 sdp absent

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 configuration mode.
Step 4	sip Example: Router(conf-voi-serv)# sip	Enters voice service SIP configuration mode.
Step 5	block 183 sdp absent Example: Router(conf-serv-sip)# block 183 sdp absent	Filters outgoing provisional responses, including "180-Alerting" and "183-Session In Progress" responses.
Step 6	exit Example: Router(conf-serv-sip)# exit	Exits the current mode.

Configuring Selective Filtering of Outgoing Provisional Response on the Cisco UBE at the Dial Peer Level

To configure Selective Filtering of Outgoing Provisional Response on the Cisco UBE at the dial-peer level, configure the outgoing dial peer as follows:

SUMMARY STEPS

1. enable

2. configure terminal

3. dial-peer voice number voip

4. voice-class sip block 183 sdp present

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 number voip Example: Router(config)# dial-peer voice 1 voip	Enters dial peer voice configuration mode.
Step 4	voice-class sip block 183 sdp present Example: Router(config-dial-peer)# voice-class sip block 183 sdp present	Filters outgoing provisional responses, including "180-Alerting" and "183-Session In Progress" responses.
Step 5	exit Example: Router(config-dial-peer)# exit	Exits the current mode.