In particular, this invention relates to user programmable toll free telephone service realizable by {HEAD ~ way} of {TAIL ~ Internet Protocol Telephony service} 
of
In particular , this invention relates to user programmable toll free telephone service realizable by { HEAD ~ way } of { TAIL ~ Internet Protocol Telephony service }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL