Telecommunication Analyst. PBX. I am a VoIP engineer and can assist with majority of PBX issues that customers are facing. I can program any of the following phones: Yealink, Polycom, Grandstream, Cisco, Avaya, Cisco, plus others. Auto Answer, IVR, Hunt Group, Park Calls, Provisioning, SIP Trunk, Host Name, IP address, static, dynamic, BLF keys, Codecs, SRV, asterisk, fowarding, DND, Voicemail, Music on Hold, Conference, DIDs, Extensions, softphone, QoS, Park buttons