When your business expands, more users and concurrent calls can be added easily to meet growing business needs through the telephony cards in the IP PBX. U-4FXU can be flexibly configured in PBX-U502/U503 by hot-plug mode to expand its functionality, it supports 4 FXO and 4 FXS per board and any four boards of the same series can be mixed according to your specific needs.
Telephone cards, IP PBX, together with other devices, like fax and analog phones allow large and medium-sized businesses to build powerful and scalable unified communication and collaboration solutions.
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