Supress TCP Echo

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Would anyone have a clue on how to suppress echo on a TCP connection?
The problem is when I use

IOCall(6,(BYTE *)&t->RcvFifo,cabuff,strlen(cabuff)); // NW -> FIFO

in my receiver function it echos the cabuff back to the other machine.

After I spawn my function;

t = TCPAlloc();
t->r.StCall = NoTel;


then in NoTel I tried every bit TELB_AE etc.

I can't seem to find any clues on the pcib() function.
Gary seems to have made some use of it in his example below
which sadly turns the echo on.

// See pg 62 of programmer guide
// From a code snip of Gary Morris
int NoTel(TCP_t *t, int typ, int mode)
{

if (typ==4)
{

// see inc/tcp.h
t->TelBits=0; //TELB_TEL|TELB_AE|TELB_WES|TELB_UNI|TELB_PHYS;
pcib(t,0xff); pcib(t,0xfb); pcib(t,1); /* WILL echo */
pcib(t,0xff); pcib(t,0xfb); pcib(t,3); /* WILL suppress go ahead */
t->TelBits|=TELB_LGA;

t->TelState=0;

}

return(1);

}