OpenVox DGW-1004 User Manual page 25

Trunk MTU With a large amount of traffic on IAX2 trunk, there is a risk of bad voice quality when allowing the Linux system to handle
fragmentation of UDP packets.
Depending on the side of each payload, allowing the OS to handle fragmentation may not be very efficient. This setting sets the
maximum transmission unit for AIX2 UDP trunking. The default is 1240 bytes which means if a trunk's payload is over 1240
bytes for every 20ms it will be broken into multiple 1240 bytes messages. Zero disables this functionality and let's the OS handle
fragmentation.
Trunk How frequently to send trunk msgs (in ms). This is 20ms by default.
Frequency
Trunk Time Should we send timestamps for the individual sub_frames within trunk frames? There is a small bandwith use for these (less
Stamps than 1kbps/call), but they ensure that frame timestamps get sent end-to-end properly. If both ends of all your trunks go directly to
TDM, _and_your trunkfreq equals the frame length for your codecs, you can probably suppress these. The receiver must also
need to have it enabled.
Min. Minimum amounts of time that IAX2 peers can request as a registration interval (in seconds).
RegExpire
Max. Maximum amounts of time that IAX2 peers can request as a registration expiration interval(in seconds).
RegExpire
Advanced SIP Settings
Networking
Table 4-2-1 Definition of Networking Options
Options Definition
UDP Bind Choose a port on which to listen for UDP traffic.
Port
Enable TCP Enable server for incoming TCP connection (default is no).
TCP Bind Choose a port on which to listen for TCP traffic.
Port
TCP The maximum number of seconds a client has to authenticate. If the client does not authenticate before this timeout expires,
Authentication the client will be disconnected.(default value is: 30 seconds).
Timeout
TCP The maximum number of unauthenticated sessions that will be
Authentication allowed to connect at any given time (default is: 50).
Limit
Enable Enable DNS SRV lookups on outbound calls Note: the gateway only uses the first host in SRV records Disabling DNS SRV
Hostname lookups disables the ability to place SIP calls based on domain names to some other SIP users on the Internet specifying a
Lookup port in a SIP peer definition or when dialing outbound calls with suppress SRV lookups for that peer or call.
Enable Whether enable the internal SIP calls or not when you select the registration option "Endpoint registers with this gateway".
Internal SIP
Call
Internal SIP Specify a prefix before routing the internal calls.
Call Prefix
Advanced: NAT Settings
Table 4-2-2 Definition of NAT Settings Options