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Global Call IP Technology Guide — November 2007
Dialogic Corporation
Table 26. Valid Extension IDs for the gc_Extension( ) Function
Extension ID Description
IPEXTID_CHANGEMODE Used with gc_Extension( ) for the following T.38 fax server operations:
• initiating a switch from an audio session to a T.38 fax session
• initiating a switch from a T.38 fax session to an audio session
• accepting a request to switch from audio to T.38 fax or vice versa
• rejecting a request to switch from audio to T.38 fax or vice versa
Also used in GCEV_EXTENSION events to provide notification of
incoming messages including:
• a RequestMode (H.323) or re-INVITE (SIP) message indicating a
request to switch from audio to T.38 fax
• a RequestMode (H.323) or re-INVITE (SIP) message indicating a
request to switch from T.38 fax to audio
• a RequestModeAck (H.323) or 200 OK (SIP) message indicating that
a switch to audio or T.38 fax has completed successfully
See Section 4.26, “T.38 Fax Server”, on page 320 for more information.
This extension ID is not supported in 3PCC operating mode.
IPEXTID_FOIP Used in GCEV_EXTENSION events for notification of information related
to fax. See Section 4.6.1, “Enabling and Disabling Unsolicited Notification
Events”, on page 154 for more information.
This extension ID is not supported in 3PCC operating mode.
IPEXTID_GETINFO Used to retrieve call-related information. See Section 4.5, “Retrieving
Current Call-Related Information”, on page 141 for more information.
IPEXTID_IPPROTOCOL_STATE Used in GCEV_EXTENSION events for notification of intermediate
protocol states, such as, Q.931 and H.245 session connections and
disconnections. See Section 4.6.1, “Enabling and Disabling Unsolicited
Notification Events”, on page 154 for more information.
IPEXTID_MEDIAINFO Used in GCEV_EXTENSION events for notification of the initiation and
termination of media streaming in the transmit and receive directions. In
the case of media streaming connection notification, the datatype of the
parameter is IP_CAPABILITY and consists of the coder configuration that
resulted from the capability exchange with the remote peer. See
Section 4.6.1, “Enabling and Disabling Unsolicited Notification Events”,
on page 154 for more information.
This extension ID is not supported in 3PCC operating mode.
IPEXTID_MSGINFO Used in GCEV_EXTENSION events for receiving SIP messages with
MIME-encoded information in the message body. See Section 4.10,
“Using MIME Bodies in SIP Messages (SIP-T)”, on page 188, for more
information. The supported parameter sets are:
• IPSET_MIME
• IPSET_MIME_200OK_TO_BYE
IPEXTID_RECEIVE_DTMF Used to select which DTMF types, when detected, provide notification to
the application. See Section 4.6.1, “Enabling and Disabling Unsolicited
Notification Events”, on page 154 for more information.
This extension ID is not supported in 3PCC operating mode.
IPEXTID_RECEIVEMSG Used in GCEV_EXTENSION events when SIP, Q.931, H.245, and non-
standard registration messages are received.