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About product and suppliers:
        Alibaba.com offers 843 pstn ip products. such as paid samples, free samples. 

There are 823 pstn ip suppliers, mainly located in Asia. The top supplying countries or regions are China, Taiwan, China, and India, which supply 97%, 1%, and 1% of pstn ip respectively. 

Pstn ip products are most popular in Eastern Europe, Mid East, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 415 with ISO9001, 73 with ISO14001, and 40 with OHSAS18001 certification.