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About product and suppliers:
        Alibaba.com offers 570 telephone main board products. About 8% of these are other pcb & pcba, 1% are power distribution equipment. 

A wide variety of telephone main board options are available to you, such as 4-layer, 6-layer, and 8-layer. You can also choose from free samples, paid samples. 

There are 568 telephone main board suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and Japan, which supply 99%, 1%, and 1% of telephone main board respectively. 

Telephone main board products are most popular in North America, Southeast Asia, and Northern Europe. 

You can ensure product safety by selecting from certified suppliers, including 131 with ISO9001, 50 with Other, and 7 with ISO14001 certification.