|Feature||H.323||H.323 with SA8874||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
|Supervised transfer (also called consultative transfer)||Operates like a blind transfer
Note: The only supported VoiceXML event for this transfer is error.connection.noroute.
|Bridge transfer (see also Bridge transfers in a mixed SIP/H.323 environment)||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|
|Playing prompt files||Supported||Supported||Supported|
|Converse-on vectoring||Supported||Supported||Not supported|
|Quality of Service||Supported||Supported||Supported|
|User to User Information (UUI)||Not supported||Not supported||For an incoming call, UUI values are populated in the VoiceXML session variables for both UUI & Application to Application Information (AAI).
For outbound calls, define the property aai or aaiexpr in the VoiceXML <transfer> tag.
|Switch failover||An alternate gatekeeper address can be specified in the VPMS||An alternate gatekeeper address can be specified in the VPMS||No additional support is supplied by Voice Portal, but SES hardware has failover support and MPPs can be configured as members of an adjunct in the SES|