I am trying to determine the capabilities of Freeswitch. I have also read through the technical recommendations for SIPConnect from the SIP forum. The reference architecture at the enterprise end shows IP-PBX <-> SIP proxy <-> firewall <-> internet. Using Freeswitch is the proxy necessary or is FS capable of doing the fixups and the TLS negotiation? The following requirements come to mind. TLS connection to a service provider no private addresses, implies local NAT traversal canonical addresses only manipulation of To and From headers support asserted identity