Here is an example.
It is a HiPath 4000 (V3) interconnecting with a (HiPath 3000) - EURO SETUP - 30 Channels
A bit dated but I can't find any newer at the minute.
It uses Cornet (Corporate Net) but it works.
If you need to use a different protocol you have to deactivate the trunk on the 4K side first.
If you are successful then ring an extension on the 3K and put a 'callback' on to it
If the callback works then your link should be good.
ADD-COT:201,RCL&ANS&USD&KNOR&CEBC&TIE&CBBN&CBFN&FNAN&COTN&IEVT&ITRN&BSHT&DPRE&LW
NC&SATC&NLCR&APPR&TSCS&ICZL&ICZO&UUS1&UUS2&UUS3&US1E&NLRD&SNBE&DSDL&CTLS&NTON,,;
CHANGE-COT:201,COTADD,,S2CONN,"COT FOR 3750";
ADD-COP:201,RLSB&RLSA&NOAN&RMSG&RRST,TA,TA,,;
CHANGE-COP:201,COPADD,,,,S2CONN,"COP FOR 3750";
CHANGE-LWPAR

IUS2,4,COPPER,S2,ON,Y,16,0,D5,10,10,Y,Y,DF,N,0,255,N,Y,S2CONN,"LINK TO 3750";
ADD-BUEND:201,HIPATH 3750,30;
ADD-BCSU

IU,1,2,25,"Q2196-X ","0",,,,,1,,,,,A,0;
ADD-TDCSU:NEW,1-02-025-1,201,201,0,0,31,31,31,"HIPATH3K",201,"CORNV33",1,,NONE,,,,GDTR,N,TIE,NONE,N,0,,,,,,,31,MANY,1-1-201,0,1,1,EMPTY,201,4,N,,UNKNOWN,0,,,16,8,1,10,40,EC&G711&G729OPT,"LINK TO HIPATH 3750",201,CIR,Y,S2CONN,1&&30,N,1,4,0,0,0,0,0,;
CHA-REFTA:CIRCUIT,1-2-25-1,0,,,0;
RES-DSSU

EN,1-2-12-1;
DIS-SDSU:ALL,,PEN,PER3,1,2,25,1; (Channels should show ready at this stage)
ADD-WABE:201,,,NETRTE,N,,,,,,,,;
ADD-RICHT:CD,201,201,,,0,ALL,"3750 SITE",,,201,,,,201,,,,,,201,,,201,NEUTRAL,NO,NO,;
CHANGE-RICHT:CD,201,,0,VCE,DTMF,FIX,,,PP80;
ADD-LODR:201,,,,ECHO,1;
ADD-LODR:201,,,,END;
ADD-LODR:201,,,"LINK TO 3750 SITE",;
ADD-LDAT:201,ALL,1,,201,201,64,,1,EMPTY,NONE,201,4,,,,,,,,,,,,;
EXTENSIONS YOU HAVE ON THE 3750 SITE ARE TO BE SENT DOWN THE ROUTE TO THE 3750 SITE: - EXAMPLE EXTENSION 1234
ADD-WABE:1234,,,STN,N,,,,,,,,;
CHANGE-WABE:1234,201,,,,,,;
Keyword orientated (this may help if your versions of 4K are different)
ADD-COT:COTNO=201,PAR=RCL&ANS&USD&KNOR&CEBC&TIE&CBBN&CBFN&FNAN&COTN&IEVT&ITRN&BSHT&DPRE&LWNC&SATC&NLCR&APPR&TSCS&ICZL&ICZO&UUS1&UUS2&UUS3&US1E&NLRD&SNBE&DSDL&CTLS&NTON;
CHANGE-COT:COTNO=201,COTTYPE=COTADD,DEV=S2CONN,INFO="COT FOR 3750 SITE";
ADD-COP:COPNO=201,PAR=RLSB&RLSA&NOAN&RMSG&RRST,TRK=TA,TOLL=TA;
CHANGE-COP:COPNO=201,COPTYPE=COPADD,DEV=S2CONN,INFO="COP FOR 3750 SITE";
CHANGE-LWPAR:TYPE=DIUS2,BLNO=4,LNTYPE=COPPER,VERSION=S2,QUAL=ON,MASTER=Y,DCHAN1=16,DCHAN2=0,PATTERN=D5,QUAL1=10,QUAL2=10,SMD=Y,PERMACT=Y,FCBAB=DF,CDG=N,FIXEDTEI=0,CNTRNR=255,TEIVERIF=N,CRC4REP=Y,DEV=S2CONN,INFO="ALL LINKS TO 3750 SITES";
ADD-BUEND:TGRP=201,NAME="3750 SITE",NO=30;
ADD-BCSU:MTYPE=DIU,LTG=1,LTU=2,SLOT=25,PARTNO="Q2196-X ",LWVAR="0",FCTID=1,HWYBDL=A,ALARMNO=0;
ADD-TDCSU:OPT=NEW,PEN=1-02-025-1,COTNO=201,COPNO=201,DPLN=0,ITR=0,COS=31,LCOSV=31,LCOSD=31,CCT="3750 SITE",DESTNO=201,PROTVAR=CORNV33,SEGMENT=1,DEDSVC=NONE,TRTBL=GDTR,SIDANI=N,ATNTYP=TIE,CBMATTR=NONE,TCHARG=N,SUPPRESS=0,TRACOUNT=31,SATCOUNT=MANY,NNO=201,ALARMNO=0,FIDX=1,CARRIER=1,ZONE=EMPTY,COTX=201,FWDX=4,CHIMAP=N,DOMTYPE=UNKNOWN,DOMAINNO=0,UUSCCX=16,UUSCCY=8,FNIDX=1,NWMUXTIM=10,SRCGRP=40,CLASSMRK=EC&G711&G729OPT,TCCID="LINK TO 3750 SITE",TGRP=201,SRCHMODE=CIR,INS=Y,DEV=S2CONN,BCHAN=1&&30,BCNEG=N,BCGR=1,LWPAR=4,LWPP=0,LWLT=0,LWPS=0,LWR1=0,LWR2=0;
ADD-WABE:CD=201,DAR=NETRTE,CHECK=N;
ADD-RICHT:MODE=CD,LRTE=201,CD=201,CPS=0,SVC=ALL,NAME="3750 SITE",TGRP1=201,DESTNO=201,DNNO=201,PDNNO=201,CHARCON=NEUTRAL,NOPRCFWD=NO,CLNAMEDL=NO;
CHANGE-RICHT:MODE=CD,CD=201,CPS=0,SVC=VCE,TYPE=DTMF,DTMFCNV=FIX,DTMFPULS=PP80;
ADD-LODR:ODR=201,CMD=ECHO,FIELD=1;
ADD-LODR:ODR=201,CMD=END;
ADD-LODR:ODR=201,INFO="LINK TO 3750 SITE";
ADD-LDAT:LROUTE=201,LSVC=ALL,LVAL=1,TGRP=201,ODR=201,LAUTH=64,CARRIER=1,ZONE=EMPTY,LATTR=NONE,DNNO=201,VCCYC=4;
EXTENSIONS YOU HAVE ON THE 3750 SITE ARE TO BE SENT DOWN THE ROUTE TO THE 3750 SITE: - EXAMPLE EXTENSION 1234
ADD-WABE:CD=1234,DAR=STN,CHECK=N;
CHANGE-WABE:CD=1234,DESTNO=201;
CHA-REFTA:CIRCUIT,1-2-25-1,0,,,0;
RES-DSSU

EN,1-2-12-1;
DIS-SDSU:ALL,,PEN,PER3,1,2,25,1; (Channels should show ready at this stage)