annual maintenance contract annual maintenance contract for 01 x 100 lines epbax exchange at nowgong , exchange base model for 100 lines epabx having following , remote access unit , strong memory device , interface cards , power supply cards , signaling cards , tone cards , conf cards , alarm system , lte extensions , analg suscriber cards ( normal&long line ) , digital suscriber cards , signaling cards / other interface , asynchronus data subscriber line , dslam , isdn primary rate interface pri&bri , trunks e&m programable , bwarddid / dod programable , bwtel / ld , dlc ( dmkt ) , termination e1 streams ( qsig ) , ring down , call metering with pc and printer , malicious call tracing , voice guidance , conference call , directory services , tone dialling , normal operator console call metering , pc based maintenance and administrative consle with printer , power supply fcbc in duplicated mode 48v / 10a , normal pbt , isdn tele units with network terminal , pbt with speaker phone , plan ( 1+1 ) , dmkt , caller id tele