 Network & Telecoms Solutions
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VoIP Telephony
Voice over IP (VoIP) and IP Telephony (IPT) are frequently thought to provide the same function but this is not the case.
VoIP is ideally suited to organisations that have an existing investment in traditional PBX key systems. Traditionally, a company with one main office and four remote offices would each have a local PBX and all calls between these offices would incur charges as they utilise the PSTN (BT et al). By installing Voice Gateways (VG) and integrating these into each of the 5 PBX's, the company would be able to route calls between the various offices across their already existing data WAN. The integration is achieved by taking an E1/ISDN30 PRI trunk from the PBX and connecting this into a reciprocal E1/ISDN30 PRI card on the VG. Dial plans on the existing PBX may need to be changed so that any calls made to the other offices would be "Toll Free" calls, traversing the existing data WAN. You would not normally use IP Phones in this situation as all call features would continue to be provided by the existing PBX infrastructure.
IP Telephony
A true IP Telephony deployment (as opposed to a hybrid deployment where both IPT and VoIP are used) is where the existing PBX is replaced with a data server running IP Telephony software (in Cisco's case CallManager Software) where all call features (forward, transfer, divert etc) are provided by the software. The phones are intelligent devices with both IP and MAC addresses. All voice traffic should run over a dedicated switched voice LAN (VLAN). |
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