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Global Call IP Technology Guide — November 2007 155
Dialogic Corporation
IP-Specific Operations
Possible values (corresponding to events that can be added or removed from the mask are) are:
EXTENSIONEVT_DTMF_ALPHANUMERIC
For notification of DTMF digits received in User Input Indication (UII) messages with
alphanumeric data. When using SIP, this value is not applicable.
EXTENSIONEVT_SIGNALING_STATUS
For notification of intermediate protocol state changes in signaling (in H.323, for example,
Q.931 Connected and Disconnected) and control (in H.323, for example, H.245 Connected
and Disconnected).
EXTENSIONEVT_STREAMING_STATUS
For notification of the status and configuration information of transmit or receive directions of
media streaming including: Tx Connected, Tx Disconnected, Rx Connected, and Rx
Disconnected.
4.6.2 Getting Media Streaming Status and Connection
Information
The application can receive notification of changes in the status (connection and disconnection) of
media streaming in the transmit and receive directions as GC_EXTENSIONEVT events. When the
event is a notification of the connection of the media stream in either direction, information about
the coders negotiated for that direction and the local and remote RTP addresses is also available.
The events for this notification must be enabled by setting or adding the bitmask value
EXTENSIONEVT_SIGNALING_STATUS to the GC_EXTENSIONEVT mask; see Section 4.6.1,
“Enabling and Disabling Unsolicited Notification Events”, on page 154. Once the events are
enabled, when a media streaming connection state changes, the application receives a
GCEV_EXTENSION event. The EXTENSIONEVTBLK structure pointed to by the extevtdatap
pointer within the GCEV_EXTENSION event will contain the following information for all media
streaming status changes:
extID
IPEXTID_MEDIAINFO
parmblk
A GC_PARM_BLK containing the protocol connection status with the
IPSET_MEDIA_STATE parameter set ID and one of the following parameter IDs:
• IPPARM_TX_CONNECTED – Media streaming has been initiated in transmit direction.
The parameter value is an IP_CAPABILITY structure containing the coder configuration
that resulted from the capability exchange with the remote peer.
• IPPARM_TX_DISCONNECTED – Media streaming has been terminated in transmit
direction. No parameter value is used with this parameter ID.
• IPPARM_RX_CONNECTED – Media streaming has been initiated in receive direction.
The parameter value is an IP_CAPABILITY structure containing the coder configuration
that resulted from the capability exchange with the remote peer.
• IPPARM_RX_DISCONNECTED – Media streaming has been terminated in receive
direction. No parameter value is used with this parameter ID.
• IPPARM_TX_SENDONLY – Media streaming has been initiated for a half-duplex
transmit-only connection. The parameter value is an IP_CAPABILITY structure
containing the coder configuration that resulted from the capability exchange with the
remote peer.