3CX, VOIPConfiguring external SPA942 IP SIP phone with 3CX Posted on 08/07/2009 by Computer The instructions “How can I use the 3CX Tunnel with a SIP hardphone?” on the 3cx site at http://www.3cx.com/support/3cx-tunnel.html- What VOIP ports to open and forward for 3CX Windows 2008 and Vista Service pack 2 SP2 is available to download
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