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We present a system which is used for working group speech communication based on a LAN (local area network). In our system we need a multimedia PC and a network adapter. People may use speech to communicate with each other in the working group. The system is based on client/server architecture. Packet exchange is used to pass speech signals through the LAN. In order to shorten the speech communication delay we used the LD-CELP algorithm in the software coder/decoder for signal compression. The original speech signal is 64 kbps compressed to 16 kbps. For speech communication in the working group the system is simpler than the IP phone.