For example, rather than blocking a data call, {HEAD ~ unused voice resources} can be allocated to {TAIL ~ a data call request} 
allocated to
For example , rather than blocking a data call , { HEAD ~ unused voice resources } can be allocated to { TAIL ~ a data call request }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL