By the analysis about traditional VoIP and characteristic of data net, this text mainly dicusses the possible protocol and head problem while VoIP based on GPRS.

• 本文通过对传统VoIP技术的分析,结合GPRS分组网的特点,初步探讨了VoIP技术在GPRS上承载应着重考虑的问题及用到的协议模式。