"ddFmF
QQQ_¢_Q¬
1-146 ¤Fs¤mFsnnn
Considerations
Observability
d^p¤V^"m"VFm4"m*F"hFh*FpOh¤dazdFzdapcadd:"m"VFm4"m*F
p*F¦F=*©pmd©pmFp*F¦F""ahFO§p"VFm§a^=aOOFFm¤zF¦ap
"Fp*F¦F="m=pmF"VFm4"dd^Fp^F:^FpaVam"p¤zF¦app*F¦F
^F4"dd:"m=^Fp^F¤zF¦apazd"4F=am^F§"a"F
m"Fm="m4"m*Fp*F¦F=*¤4"mmp*F"mp*F¦F
Ineligibility
4"ddp"m"VFmF¨FmapmpaamFdaVa*dFOpp*F¦amV§^Fm^F4"dd9
"dF"=©*FamVp*F¦F=
*FamV*¤©_¦FaOaF=
"""a¦"4©"4a¦F
"""Fa4apm"4a¦F:a4pmOFFm4F=§a^"mF¨Fmapm^"^"
""Fa4apm"4a¦F:pa"4"dd^"F"4^F="mF¨Fmapm^"^"
""Fa4apm"4a¦F
"a¦"4©I"m¤"d¨4d¤apm"4a¦F:a4pmOFFm4F=§a^"mF¨Fmapm
^"^"a¦"4©I"m¤"d¨4d¤apm"4a¦F:pa"4"dd^"F"4^F=
"mF¨Fmapm^"^"a¦"4©I"m¤"d¨4d¤apm"4a¦F
am"4pmOFFm4F§^FF"==amV^Fp*F¦FF¤damhpF^"m
z"aF|FF‘‘Conferenced calls’’ on page 1-147OphpF=F"adpm
4pmOFFm4F}
��"_p*F¦F=4"dd^"F"4^F"m¤mp*F¦"*dFF¨Fmapmp
|pF^"^FpO^F^¤mVp¤z:zda:pcadd¤F=p=aa*¤F^F
4"ddp^F"apm"VFmamp4^F4cF=^FpO"apm"VFm
4pmOFFm4F=§a^^F4"dd"Fmp4^F4cF=}
Trunk calls
O"m"VFm*FamVp*F¦F=h"cF"m¤mc_4"dd:p*F¦"apm""OF^F
"VFmOama^F=a"damVp4Fm"dpOOa4F|}¤mc:=a"damVa4pma=FF=
4phzdFF§^Fm"m§F¤zF¦aapmaF¤mF=p§^Fm"m§F¤zF¦aapm
ahFp¤p44¤
Multiple observers
¤dazdFp*F¦F4"mp*F¦F"amVdFah¤d"mFp¤d©:*¤pmd©pmF
p*F¦Fap*F¦amV"Va¦Fm4"ddp^F^FFampdahap^Fm¤h*FpO
p*F¦Fp*F¦amV"amVdF"dpmV"^Fp"dm¤h*FpOp*F¦F
"4a¦Fd©p*F¦amV=pFmpF¨4FF=Q¬