TCP libraries in Erlang/OTP?

[Zhiqian Yuan]

Hi everyone, we're now doing a project on IMS which is to implemented  
by erlang. And now we're on the HSS part, our teammates are trying to  
write the protocol stack of Diameter, but we don't know if we need to  
implement the TCP protocol as well. So we wonder if there're any  
libraries avaible in the OTP framework, so that we can encapsulate the  
Diameter package. Thanks.

Regards