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About product and suppliers:
        Alibaba.com offers 3,186 duplex intercom products. About 2% of these are other telecommunications products, 1% are access control system. 

A wide variety of duplex intercom options are available to you, such as ip camera, voip phone. You can also choose from paid samples, free samples. 

There are 3,186 duplex intercom suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of duplex intercom respectively. 

Duplex intercom products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 1,007 with ISO9001, 627 with Other, and 11 with ISO14001 certification.