the ifc that is contained within the non registering endpoint 39 s user profile in step 308 after the originating processing is complete in step 310 the s cscf may perform a telephone number mapping enum query to obtain the domain name of the terminating network enum may be used to map a telephone number to a uri specifying a host that can be identified via domain name system dns dns is a system for converting host names and domain names into ip addresses on the internet the s cscf routes the call to the terminating network in step 312 fig4 is a flow chart showing the call termination flow to the nre the incoming call is routed from the originating network in step 400 and reaches an interrogating cscf i cscf in step 402 the i cscf at step 404 queries the hss based on the called party number the hss knows that the call is terminated to a statically registered nre the i cscf may use an internal algorithm such as round robin or a random generator to select a s cscf from among the list of s cscfs the call is routed to the selected s cscf at step 406 the selected s cscf in step 408 identifies the nre 39 s user profile based on the prefix domain mapping of the called party number and may invoke terminating services via a terminating application server based on the ifc for the terminating nre that is defined in the s cscf the ifc may include the puid a terminating application server t as may perform the terminating service processing and may also perform.