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About product and suppliers:
        Alibaba.com offers 346 ietf sip products. About 19% of these are voip products, 1% are cordless telephones. 

A wide variety of ietf sip options are available to you, 

There are 346 ietf sip suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of ietf sip respectively. 

Ietf sip products are most popular in North America, Domestic Market, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 153 with ISO9001, 75 with ISO14001 certification.