Looking for Good SIP server

Hi all,

I work at a Wireless ISP an we start testing some VoIP solution. We going to
deliver the long distance call of our clients through an external VoIP
carrier.
Nevertheless, we like to course the internal calls (calls that remains in
our network) through our own SIP Server. So I'm looking for a good SIP
server (that runs in Linux I suposse), and can carry our calls. Could you
recommend me a few? (If free much more better)

Moreover, is the SIP server all I need to course our own calls?
In order to clarify our topology, we going to work with Cisco ATA 186/188 in
the client side, linked to a broadband radio (Tsunami MP11.a), linked to our
NOC when we have the radio transceiver, connected to the server.

Thank you very much in advance,

Sebastian Milioto

---------------------------------
INTERCOM SRL
www.intercomwireless.com
Cid Campeador 440
Rio Tercero - Cordoba
Argentina
---------------------------------

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