Delayed Offer to Early Offer Translation for SIP Calls

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Updated:October 29, 2010

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Configuring Delayed-Offer to Early-Offer for SIP Audio Calls

Table Of Contents

Configuring Delayed-Offer to Early-Offer for SIP Audio Calls

Prerequisites

Restrictions

How to Configure Delayed-Offer to Early-Offer for SIP Audio Calls

Configuring Delayed-Offer to Early-Offer for SIP Audio Calls

This feature the alters the default configuration of the Cisco Unified BE from not distinguishing SIP Delayed-Offer to Early-Offer call flows, to forcing the Cisco Unified BE to generate an Early-Offer with the configured codecs for a incoming Delayed-Offer INVITE. To configure a Cisco Unified Border Element to send a SIP invite with Early-Offer (EO) on the Out-Leg (OL) perform the steps in this section.

Prerequisites

•To enable this feature, you must have Cisco IOS Release 12.4(20)T1 or a later release installed and running on your Cisco gateway.

•The allow-connections sip to sip command must be configured before you configure media flow-around.

Restrictions

•Cisco Unified Communications Manager 5.x supports Early-Offer over SIP trunk for audio calls with MTP.

•Support for Cisco Unified Communications Manager Early-Offer for video calls and audio calls without MTP is not supported.

Table 1 shows a list of protocol interworking for SIP.

Table 1 Supported protocol interworking

Protocol

In Leg

Out Leg

Support

H.323-to-SIP

Fast Start

Early-Offer

Bi-Directional

Slow Start

Delayed-Offer

Bi-Directional

SIP-to-SIP

Early-Offer

Early-Offer

Bi-Directional

Delayed-Offer

Delayed-Offer

Bi-Directional

Delayed-Offer

Early-Offer

Uni-Directional

How to Configure Delayed-Offer to Early-Offer for SIP Audio Calls

To Delayed-Offer to Early-Offer for SIP Audio Calls for all VoIP calls, or individual dial peers, perform the steps in this section. This section contains the following subsections:

•Configuring Delayed-Offer to Early-Offer for SIP Audio Calls at the Global Level

•Configuring Delayed-Offer to Early-Offer for SIP Audio Calls for a Dial-Peer

Configuring Delayed-Offer to Early-Offer for SIP Audio Calls at the Global Level

To configure Delayed-Offer to Early-Offer for SIP Audio Calls at the global level, perform the steps in this section.

SUMMARY STEPS

1. enable

2. configure terminal

3. voice service voip

4. allow-connections sip

5. early-offer forced

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 VoIP voice-service configuration mode.

Step 4

allow-connections from-type to to-type

Example:

Router(config-voi-serv)# allow-connections sip to sip

Allows connections between specific types of endpoints in an Cisco UBE. Arguments are as follows:

•from-type—Type of connection. Valid values: h323, sip.

•to-type—Type of connection. Valid values: h323, sip.

Note H.323-to-H.323: By default, H.323-to-H.323 connections are disabled and POTS-to-any and any-to-POTS connections are enabled.

Step 5

early-offer forced

Example:

Router(config-voi-serv)# early-offer forced

Enables SIP Delayed-Offer to Early-Offer globally.

Step 6

exit

Example:

Router(config-voi-serv)# exit

Exits the current mode.

Configuring Delayed-Offer to Early-Offer for SIP Audio Calls for a Dial-Peer

To configure Delayed-Offer to Early-Offer for SIP Audio Calls for an individual dial-peer, perform the steps in this section.

SUMMARY STEPS

1. enable

2. configure terminal

3. dial-peer voice 1 voip

4. voice-class sip early-offer forced

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 2 voip

Enters dial-peer configuration mode for the specified VoIP dial peer.

Step 4

voice-class sip early-offer forced

Example:

Router(config-dial-peer)# voice-class sip early-offer forced

Forcefully send Early-Offer

Step 5

exit

Example:

Router(config-dial-peer)# exit

Exits the current mode.

Table 1 Supported protocol interworking
Protocol	In Leg	Out Leg	Support
H.323-to-SIP	Fast Start	Early-Offer	Bi-Directional
	Slow Start	Delayed-Offer	Bi-Directional
SIP-to-SIP	Early-Offer	Early-Offer	Bi-Directional
	Delayed-Offer	Delayed-Offer	Bi-Directional
	Delayed-Offer	Early-Offer	Uni-Directional

	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 VoIP voice-service configuration mode.
Step 4	allow-connections from-type to to-type Example: Router(config-voi-serv)# allow-connections sip to sip	Allows connections between specific types of endpoints in an Cisco UBE. Arguments are as follows: •from-type—Type of connection. Valid values: h323, sip. •to-type—Type of connection. Valid values: h323, sip. Note H.323-to-H.323: By default, H.323-to-H.323 connections are disabled and POTS-to-any and any-to-POTS connections are enabled.
Step 5	early-offer forced Example: Router(config-voi-serv)# early-offer forced	Enables SIP Delayed-Offer to Early-Offer globally.
Step 6	exit Example: Router(config-voi-serv)# exit	Exits the current mode.

	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 2 voip	Enters dial-peer configuration mode for the specified VoIP dial peer.
Step 4	voice-class sip early-offer forced Example: Router(config-dial-peer)# voice-class sip early-offer forced	Forcefully send Early-Offer
Step 5	exit Example: Router(config-dial-peer)# exit	Exits the current mode.

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