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Table 65 shows the parameter IDs in the IPSET_SIP_MSGINFO parameter set. Note that access to 
SIP message header info fields is disabled by default and must be explicitly enabled by setting the 
IP_SIP_MSGINFO_ENABLE mask value in the sip_msginfo_mask field of the IP_VIRTBOARD 
structure before starting the virtual board.

Notes: 1. All parameter IDs in this parameter set are deprecated except IPPARM_SIP_HDR. The 

deprecated parameter IDs will remain in the IP Call Control Library for backward compatibility, 
but there will be no further development in relation to these parameter IDs. 

2. All of the MAXLEN defines for the deprecated SIP header fields are equated to 255 bytes. 

3. The maximum data length for the IPPARM_SIP_HDR parameter ID is not limited to 255 bytes. 

Applications using this parameter ID must use the “extended” gc_util_..._ex( ) utility functions, 
which are capable of handling parameter data longer than 255 bytes.

IPPARM_
SDP_ANSWER

Type: string †

Max length: †

Identifies parameter data as an SDP answer. 

SIP 
3PCC 
only

IPPARM_
SDP_OFFER

Type: string †

Max. length: †

Identifies parameter data as an SDP offer.

SIP 
3PCC 
only

IPPARM_
SDP_OPTION_
ANSWER

Type: string †

Max. length: †

Identifies parameter data as an SDP answer being 
exchanged in an OPTIONS transaction (e.g., outside a 
dialog)

SIP 
3PCC 
only

IPPARM_
SDP_OPTION_
OFFER

Type: string †

Max. length: †

Identifies parameter data as an SDP offer being 
exchanged in an OPTIONS transaction (e.g., outside a 
dialog)

SIP 
3PCC 
only

† For parameters with data of type String, the length in a GC_PARM_BLK is the length of the data string plus 1.
‡ The maximum data size for all parameters in this set is defined by the max_parm_data_size parameter that is set in the 
IPCCLIB_START_DATA structure before the system is started.

IPPARM_CALLID_HDR
(deprecated)

Type: string †

Size: max length = 
IP_CALLID_HDR_MAXLEN

Deprecated parameter to set or 
retrieve the Call-ID header field 
in SIP messages.

Note: This parameter overrides 

any Call-ID value set via 
IPSET_CALLINFO/ 
IPPARM_CALLID.

SIP 
only

† 

For parameter s with data of type String, the length in a GC_PARM_BLK is the length of the data string plus 1.