Comparison of features supported on H.323 and SIP

This table compares:

Standard H.323
H.323 with the Avaya Special Application SA8874 feature enabled in Communication Manager
SIP

Feature H.323 H.323 with SA8874 feature SIP

Outbound calling using the Application Interface web service

Partially supported

No call progress information is available, so an application may start before a call is answered

Supported

Call conferencing Supported Supported Supported

Call classification Supported Supported Supported

Blind transfer Supported Supported Supported

Supervised transfer (also called consultative transfer)

	Note:
	If a connection cannot be established, the Consultative Transfer feature in Experience Portal allows the application to regain control of the call.

Operates like a blind transfer

	Note:
	The only supported VoiceXML event for this transfer is `error.connection.noroute`.

Supported

Bridge transfer )

Partially supported

No call status information, such as "line is busy", is available

Supported

Supported except for the VoiceXML <transfer> tag’s connecttimeout parameter, which is not supported

DTMF detection

	Note:
	Experience Portal supports only out-band DTMF detection for H.323 and H.323 with SA8874 feature.

Supported

	Note:
	In case of SIP VoIP connection, the signaling group doesn’t support the out- band option. It supports the in-band and RTP-payload DTMF options.

Playing prompt files Supported Supported Supported

Recording Supported Supported Supported

Converse-on vectoring Supported Supported Not supported

Encryption options

Disabled
AES
AEA

Disabled
AES
AEA

Disabled
TLS
SRTP

Quality of Service Supported Supported Supported

User to User Information (UUI)

Not supported

For an incoming call, UUI values are populated in the VoiceXML session variables for both UUI and Application to Application Information (AAI).

For more information, see Universal Call Identifier (UCID) values included in UUI data.

Universal Call Identifier (UCID)

Supports the capability to receive UCID over H323 from Communication Manager.

	Note:
	This capability is available in Communication Manager 5.2. To enable this feature, you need to administer ucid-info on button 10 on the 7434ND stations used by Experience Portal.

Supports the capability to receive UCID over H323 from Communication Manager.

	Note:
	This capability is available in Communication Manager 5.2. To enable this feature, you need to administer ucid-info on button 10 on the 7434ND stations used by Experience Portal.

Supports the capability to both send and receive UCID.

For more information, see Universal Call Identifier (UCID) values included in UUI data.

Switch failover An alternate gatekeeper address can be specified in the EPM, and an alternate gatekeeper address list can come from Communication Manager An alternate gatekeeper address can be specified in the EPM, and an alternate gatekeeper address list can come from Communication Manager No additional support is supplied by Experience Portal, but the Avaya Aura®Session Manager (AASM) has support for high availability including switch failover support.

Merge (Refer with replaces) Not supported Not supported Supported

Bridge transfers in a mixed SIP/H.323 environment

If you have both SIP and H.323 connections defined in your Experience Portal system, Experience Portal handles bridge transfers in the following manner. For an outbound call with:

SIP or SIPS in the ToURI field, there must be a SIP outbound channel available.
TEL in the ToURI field, Experience Portal tries to get an outbound port from the same H.323 port group. If none are available, Experience Portal tries any H.323 port.
If no H.323 ports are available, Experience Portal converts the TEL into SIP in the ToURI field and tries and get a SIP outbound channel.