Summary

This Recommendation describes the principles used to identify a single SDP sub-field and how to apply wildcarding to that sub-field. The sub-field may be fully specified, wildcarded (CHOOSE "$" or ALL "*") or not significant "-". Being able to identify a single sub-field is of use when requesting the MG to choose a parameter, specifying a range or for the purposes of auditing. Further specification of how SDP can be wildcarded will assist in interoperation between a Media Gateway Controller and a Media Gateway.