[asterisk-users] SIP Proxy

[Ronaldo]

Hi all,

I want to deploy a SIP Proxy but I just don't know which one to choose.
Researching in the Internet I found the following ones:

    * SIP Express Router
      <http://www.voip-info.org/wiki/view/SIP+Express+Router>: SER is
      used by many SIP providers standalone or in conjunction with Asterisk
    * Vovida.org <http://www.voip-info.org/wiki/view/Vovida.org>
    * sipX <http://www.voip-info.org/wiki/view/sipX> from Sipfoundry
      <http://www.voip-info.org/wiki/view/SIPfoundry> is a native SIP
      proxy but also a complete SIP PBX
    * OpenSER <http://www.voip-info.org/wiki/view/OpenSER> - scalable
      and robust SIP server with TLS support


Can anyone suggest me something about these SIP Proxy?

p.s) Is Asterisk a SIP Proxy?

Regards ...

Ronaldo.