Planet Networking & Communication IPX-2100 User Manual page 59

Item
External IP
External Host
External Refresh
Local Network Address
Item
T.38 fax (UDPTL) Passthrough
Internet Telephony PBX System
Address that we're going to put in outbound SIP
messages if we're behind a NAT
Alternatively, you can specify an external host, and
Asterisk will perform DNS queries periodically. Not
recommended for production environments! Use external
IP instead
How often to refresh external host if used. You may
specify a local network in the field below
192.168.0.0/255.255.0.0' : All RFC 1918 addresses are
local networks, '10.0.0.0/255.0.0.0' : Also RFC1918,
'172.16.0.0/12' : Another RFC1918 with CIDR notation,
'169.254.0.0/255.255.0.0' : Zero conf local network
Enables T.38 fax (UDPTL) passthrough on SIP to SIP
calls
59
Explanation
Explanation
IPX-2100