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The following code snippet provides an example of enabling message header and body access for
two virtual boards:
INIT_IPCCLIB_START_DATA(&ipcclibstart, 2, ip_virtboard);
INIT_IP_VIRTBOARD(&ip_virtboard[0]);
INIT_IP_VIRTBOARD(&ip_virtboard[1]);
ip_virtboard[0].sip_msginfo_mask = IP_SIP_MSGINFO_ENABLE | IP_SIP_MIME_ENABLE;
ip_virtboard[1].sip_msginfo_mask = IP_SIP_MSGINFO_ENABLE | IP_SIP_MIME_ENABLE;
The following topics describe how applications send, receive, and respond to SUBSCRIBE and
NOTIFY requests:
• Sending SUBSCRIBE Requests
• Receiving Responses to SUBSCRIBE Requests
• Receiving SUBSCRIBE Requests
• Responding to SUBSCRIBE Requests
• Sending NOTIFY Requests
• Receiving Responses to NOTIFY Requests
• Receiving NOTIFY Requests
• Responding to NOTIFY Requests
4.15.1 Sending SUBSCRIBE Requests
To send a SUBSCRIBE request message, the application begins by creating a GC_PARM_BLK
that contains an element with the IPSET_MSG_SIP set ID, the IPPARM_MSGTYPE parameter ID
and the IP_MSGTYPE_SIP_SUBSCRIBE parameter value. The application adds elements for the
desired header fields and one or more MIME body parts, if appropriate, to the parameter block,
then uses the gc_Extension( ) function to send the message. The header may include any
combination of standard header fields and proprietary header fields. General techniques for setting
header fields are described in Section 4.9.5, “Setting SIP Header Fields for Outbound Messages”.
The technique for constructing MIME body parts is described in Section 4.10.4, “Sending MIME
Information”.
The header fields that normally must be set in a SUBSCRIBE request include the following:
• To display string (IPPARM_TO_DISPLAY)
• From display string (IPPARM_FROM_DISPLAY)
• Expires header field (IPPARM_EXPIRES_HDR)
• Event header field (IPPARM_EVENT_HDR)
• Call-ID header field (IPPARM_CALLID_HDR)
SUBSCRIBE requests normally contain an Expires header field, which indicates the duration of
the subscription. When the application does not explicitly set an Expires header field, the default
duration that is defined in the SIP “event package” for the particular type of event will apply. To
keep a subscription effective beyond the accepted duration, the subscriber needs to send a new
SUBSCRIBE message on the same dialog when it receives an expiration message. To terminate or
unsubscribe an existing subscription, the application can send a SUBSCRIBE request with the
value 0 in the Expires header field to specify immediate expiration.