Voice Portal feature by protocol compatibility chart
| 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 |
Supported | Supported |
| Blind transfer | Supported | Supported | Supported |
| Supervised transfer (also called consultative transfer) | Operates like a blind transfer
Note: The only supported VoiceXML event for this transfer is error.connection.noroute. |
Supported | Supported |
| 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 |
| DTMF detection | Supported | Supported | Supported |
| Playing prompt files | Supported | Supported | Supported |
| Recording | Supported | Supported | Supported |
| Converse-on vectoring | Supported | Supported | Not supported |
| Encryption options |
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| 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 |