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About product and suppliers:
        Alibaba.com offers 328 ietf sip products. About 16% of these are voip products. 

A wide variety of ietf sip options are available to you, such as voip phone, voip gateway, and video phone. 

There are 328 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 151 with ISO9001, 74 with ISO14001 certification.