Kartel Telekomunıkasyon Sıstemlerı
Phones, IP-PBX, VoIP, BRA, CCS7, Central Office, Caller ID,CIS,CLIP,Converter,DSS1,E&M,E1,ISDN,ISUP,LCR,MFCR2,MFR1,PRA,QSIG,R1.5,R2,ZSL/SL,SLM,SS7,SSP,STP,V5.2, SS No7, H323, gatekeepers, gateways, register, G.723.1, G72........
