There is one bit of setting this up that I'm having trouble finding good examples - and perhaps the weakest part of the book. I have a real firewall (not a router with some hacked up Linux kernel) that I DNAT the appropriate ports to the freeswitch server. I would think there would be some place in the default configs where one would/could specify four things: Server host name as seen from LAN Server IP address as seen from LAN Public FQDN as seen from Internet Public IP address as seen from Internet There is something - in the book here there is a brief mention of : ext-sip-ip and ext-rtp-ip and more at https://wiki.freeswitch.org/wiki/Sofia.conf.xml#ext-rtp-ip I'm assuming that the parameter sip-ip means internal-sip-ip and rtp-ip means internal-rtp-ip ? If I directly define these will I mess up NAT transversal on a external phone that is behind NAT? ( At one time I actually understood how a stun router worked - the insight might have only lasted for a day, but I can understand this stuff). These are seperately defined in: /etc/freeswitch/sip_profiles/external.xml and /etc/freeswitch/sip_profiles/internal.xml Which makes me think I don't understand the context of 'internal' and 'external' as used for sip profiles? I was assuming that external was for calls from the public internet and internal were for calls from the local LAN - but I'm not sure anymore. This combined with the use of <domain name="$${domain}"> at the top of directory/default.xml - which IP address should it be? - Should there be two similar sections - one for the internal IP address and a second for the external IP address? What if I go on a trip and want to register my extension from outside? - just what is domain used for in the directory? and also the line in directory/default.xml <param name="dial-string" value="{^^:sip_invite_domain=${dialed_domain}:presence_id=${dialed_user}@${dialed_domain}}${sofia_contact(*/${dialed_user}@${dialed_domain})}"/> </params> I think it defines the sip invitation string? - should it be different for the internal/vs external IP addresses? I have a feeling like there is something obvious that I don't get. I think it is important to know what is going on here before I start working with the ALCs -------------------------------------------------------------------------------- Karl Schmidt EMail Karl@xtronics.com Transtronics, Inc. WEB http://secure.transtronics.com 3209 West 9th Street Ph (785) 841-3089 Lawrence, KS 66049 FAX (785) 841-0434 It is a miracle that curiosity survives formal education. -Albert Einstein --------------------------------------------------------------------------------