4.4. Sending Protocol Messages

The following message types are supported:

• UII Message (H.245)
• Nonstandard Command Message (H.245)
• Facility Messages (Q.931)

Table 10 summarizes the set IDs and parameter IDs used to send the messages and describes the call states in which each message should be sent.

Table 10. Summary of Protocol Messages that Can be Sent

Type	Set ID	Parameter ID	When Message Should be Sent
UII message (H.245)	IPSET_USERINPUTINDICATION	IPPARM_UII_ALPHANUMERIC	When the call is in the Connected state only.
Nonstandard Command Message (H.245)	IPSET_MSG_H245	IPPARM_MSGTYPE (set to IP_MSGTYPE_H245_COMMAND	When the call is in the Connected state only.
Facility message (Q.931)	IPSET_MSG_Q931	IPPARM_MSGTYPE (set to IP_MSGTYPE_Q931_FACILITY	In any call state.

Notes:

1. Nonstandard UII messages are not supported.
2. When using the gc_Extension( ) function with the IPEXTID_SENDMSG extension ID, the gc_Extension( ) function must be called in synchronous mode, that is, the mode parameter must be set to EV_SYNC.

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