Comparison of features supported on H.323 and SIP

Last Updated : Sep 22, 2021 |
Prolog information
Metadata
Keywords:
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
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
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
Supported
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
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.