Question about Hitachi WIP-5000 IP Wireless Phone

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All of a sudden I am not able to hear people - they can hear me. This is intermittent.

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First, Hello! Second.

VOIP means Voice over IP, naturally VOIP is a realtime communication and there fore is prone to error. Let me explain in more detail.

TCP/IP (Transfer Control Protocol/Internet Protocol) uses two communnication protocols, TCP(Transfer Control Protocol) and UDP (User Datagram Protocol).

The TCP uses sequencing and acknowledment in order to start the connection, transfer data, acknowledge data arrives in order to send the subsequent data segment. In order word is like mail delivery with confirmation.

The UDP is like besto effort delivery. "I sent the data and hope you get it". Because the data travel many different ways in many Packets TCP send the data, but on destination arrives the segments in different order, The TCP puts them together, on realtime it will imposible to understand the other party in this way. So, this is why you sometimes you see squares or "error" on video streaming, because video is in real time, if you have to wait for all the packet to get toghether take toooooo much time.

So you have to check for Qos or resuce you transfers over internet while sepaking. On Wikipedia are very good info on Qos. Theres router with Qos integrated to ensure some bandwith is dedicated to VOIP transmissions. I Hope It Helps! Good Day!

Posted on Jul 02, 2009


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