The sdp_delete_all_field() function deletes all occurrences of the SDP field that is specified by the field parameter from the SDP structure. For example, if an SDP structure has three BANDWIDTH (b=) fields, calling this function with a value of SDP_BANDWIDTH_FIELD in the field parameter deletes all three BANDWIDTH fields from the session structure.
Return Values: The sdp_delete_all_field() function returns 0 when the function completes successfully. When the session argument is NULL or the field type is unknown, the function returns EINVAL. The value of errno does not change in the event of an error.