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Global Call IP Technology Guide — November 2007 181
Dialogic Corporation
IP-Specific Operations
• Content-Disposition †
• Content-Encoding †
• Content-Language †
• Content-Length
• CSeq
• Date
• Diversion † *
• Event † *
• Expires † *
• From † *
• Max-Forwards
• Min-Expires
• Min-SE
• Proxy-Authenticate
• Proxy-Authorization
• RAck
• Referred-By † *
• Refer-To
• Replaces † *
• Request-URI † *
• Require †
• Retry-After
• Route
• RSeq
• Session-Expires
• Subscription-State
• Supported †
• To † *
• Unsupported
• Via
• Warning
• WWW-Authenticate †
The following code snippet illustrates how an application would register to receive the six SIP
header fields required for use of OPTIONS messages that are not accessible via header-specific
parameter defines.
Note: This example uses gc_util_insert_parm_ref( ) rather than gc_util_insert_parm_ref_ex( )
because it is known that header field name strings are short and never come close to the 255 byte
data length limit.