Would this be VIA a cisco router or similar or is it just a direct connection in a campus or similar.
Just wondering if you could use ISDN to get features and names etc.
If it were me I would add an ISDN connection between the 2 systems using modems/fibre/media converters end to end.
If they are back to back in the same room then a direct cable between the 2 systems with ISDN setup would be best.
You get feature transparency with names and essentially end users will not know they are on a different system.
With E&M you will just have an external connection that you can accept calls from and ring to.
E&M was normally used as an 'off premises extension' where the local carrier provided the circuit end to end and you connected both sides to systems.
You can get adaptors that use E&M but give you ordinary analogue dial tone so as you can add it as an ordinary trunk.
There are two main types DC5A and AC15
To add E&M DC5A on the 4K (linking to an older Cisco router)
ADD-COT:77,RCL&XFER&ANS&DSIT&CEOC&CEBC&BRAR&RCLS&BSHT&DPRE&CECO&DFNN&NITO&DSDL&LBPR&CTLS&NTON;
CHANGE-COT:77,COTADD,,INDEP,"COT FOR DC5A TIE LINE";
ADD-COP:77,DTMF&ANS&SACK&LSUP&SFRM&RLSB&RLSA&DTBR&DITW&TIE&SPTR&NTON&PDP1&IDP1&DTM1,TA,TA;
CHANGE-COP:77,COPADD,,,,INDEP,"COP FOR DC5A TIE LINE";
ADD-BUEND:77,"DC5A TIE LINE",1;
ADD-BCSUER,1,1,8,"Q2292-X100",0,0,,,,,,A;
ADD-VADSUIR,102,1,2,0,0,0,0,SU,DC5A;
ADD-TACSU:1-1-8-0,,77,77,0,0,31,31,31,,77,1,"ABERDEEN 1 ",0,77,102,1,EMPTY,0,NONE,NONE,0,EC&G711&G729OPT,"DC5A ",0,GDTR,0,,Y,TC,EMCONT2,0,,0,0,1,2,1,0,DTMF-DTMF,0-0,0;
Routing is then added as standard
RICHT
LODR
LDAT
LDPLN OR EXTN TO DESTNO IF CD RICHT
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