The SIP data is sent to {HEAD ~ a corresponding destination network node} using {TAIL ~ NAS control information} included in the NAS control message 
using
The SIP data is sent to { HEAD ~ a corresponding destination network node } using { TAIL ~ NAS control information } included in the NAS control message
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH