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

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

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.