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.

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

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 https://cfnng.cisco.com/. An account on Cisco.com is not required.

Table 1. Feature Information for Selective Filtering of Outgoing Provisional Response on the Cisco UBE
Feature Name	Releases	Feature Information
Selective Filtering of Outgoing Provisional Response on the Cisco Unified Border Element	Baseline Functionality	This feature adds support on Cisco UBE 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. The following commands were introduced or modified: block , and voice-class sip block .

Restrictions for Selective Filtering of Outgoing Provisional Response on the Cisco UBE

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 UBE

Configure 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

enable
configure terminal
voice service voip
sip
block 183 sdp absent
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.

Configure 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

enable
configure terminal
dial-peer voice number voip
voice-class sip block 183 sdp present
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.

Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards

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