a call processing method and system in which the use of the mgw between the rnc and the peer party is limited to only certain situations . this invention uses rfc 3267 on the rnc . this will avoid inserting a mgw context for framing conversion only . this invention provides an optimization that sets up calls from the rnc , thus avoiding the need for a mgw in the path for basic calls . with this optimization , the usage of dsp and packet resources and the number of mgw chassis , as well as bearer path delay , are all reduced .