Future of VOIP
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Depending on who you talk to or which web site you visit, the growth of voice traffic over IP is expected to grow expeditiously but exact numbers vary by analysts. One website claims "VOIP traffic is projected to account for approximately 75 percent of the world's voice traffic by 2007." VOIP can achieve this figure by developing advances in features and applications, industry standardization of protocols for call handling, and global acceptance. Much of the infrastructure that is used to handle IP data already exists and therefore IP hardware will not drastically change in the next few years.
The novelty of making phone calls over the Internet at a rate of 3.9 cents per minute can get the attention of any cost saving consumer and company. However, VOIP must also incorporate value added features such as voice messaging, call hold, call transfer (Blind, Alternative and Operator Assisted), call forwarding, call waiting, conferencing (Multicast, Multi-unicast, Bridged), call park, directed call pickup, calling line ID, call return, call queuing, automatic call distribution, and third party call control. Many of these features will be necessary since they are popular with customers on the PSTN. The issues of local calls must also be addressed for right now it is not possible for VOIP to distinguish between local and long distance calls. I solution would be to program the PBX to look for local calls going out of the CPE and then routing the call through the PSTN so the customer does not get charged for a long distance call over the IP network...