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Global Call API Library Reference — November 2007
Dialogic Corporation
IP_CAPABILITY — basic capability information
direction
Identifies the direction and state of the stream that the media attributes in this structure apply
to. Possible values are:
• IP_CAP_DIR_LCLRECEIVE – Capabilities specified in the structure refer to receive
direction of a full duplex media session.
• IP_CAP_DIR_LCLRECVONLY – Capabilities refer to a half-duplex, receive-only media
session.
• IP_CAP_DIR_LCLSENDONLY – Capabilities refer to a half-duplex, send-only media
session.
• IP_CAP_DIR_LCLTRANSMIT – Capabilities specified in the structure refer to transmit
direction of a full duplex media session.
• IP_CAP_DIR_LCLTXRX – Capabilities specified in the structure refer to both transmit
and receive directions of a symmetrical full duplex media session. Supported for T.38
only.
• IP_CAP_DIR_LCLRTPINACTIVE – Capabilities refer to a media session that has been
put on hold but with RTCP still active. RTP streaming is temporarily disabled until
direction value is changed again. This value is only valid when using SIP, and only when
sending or responding to a re-INVITE request.
• IP_CAP_DIR_LCLRTPRTCPINACTIVE – Capabilities refer to a media session that has
been put on hold with RTCP as well as RTP inactive. Both RTP and RTCP streaming are
disabled until direction value is changed again. This value is only valid when using SIP,
and only when sending or responding to a re-INVITE request.
• IP_CAP_DIR_RMTRECEIVE – Coder in a FastStart offer was specified by the remote
end to be Receive-only. Only supported when retrieving FastStart coder information from
GCEV_OFFERED events.
• IP_CAP_DIR_RMTTRANSMIT – Coder in a FastStart offer was specified by the remote
end to be Transmit-only. Only supported when retrieving FastStart coder information from
GCEV_OFFERED events.
• IP_CAP_DIR_RMTTXRX – Coder in a FastStart offer was specified by the remote end to
be capable of both Transmit and Receive. Only supported when retrieving FastStart coder
information from GCEV_OFFERED events.
• IP_CAP_DIR_RMTRTPINACTIVE – Coder in a FastStart SDP offer was specified by
the remote end to have a direction attribute of “a=inactive” in the “m=” line, which is used
to deactivate RTP streaming. Only supported when retrieving FastStart coder information
from GCEV_OFFERED events and only when using SIP.
• IP_CAP_DIR_RMTRTPRTCPINACTIVE – Coder in a FastStart SDP offer was specified
by the remote end to have an RTP address of 0.0.0.0 in the “c=” line, which is used to
deactivate both RTP and RTCP. Only supported when retrieving FastStart coder
information from GCEV_OFFERED events, and only when using SIP.
payload_type
Not currently supported.
extra
The contents of this IP_CAPABILITY_UNION will be indicated by the type field.
rfu
Reserved for future use. Must be set to zero.