Crystal Business Center

ул. "Осогово" 40, Sofia, Bulgaria, 1303

Crystal Business Center is located in the central part of Sofia, on the corner of "Osogovo" street. and "Todor Aleksandrov...

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Practical SIP Telephony

21 Hours

SIP protocol in VoIP

21 Hours

VoIP with Cisco CallManager Express

35 Hours

Practical Voice and Video over IP

21 Hours

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