Specifications

Matrix SETU ATA211 System Manual 33
Advanced
1. Select the default SIP Transport for outgoing SIP messages from the following options:
• UDP: Outgoing messages are transported using UDP.
• TCP: Outgoing messages are transported using TCP.
• TCP (Fallback to UDP): TCP is used for outgoing messages. However, if the TCP connection fails, the
system will attempt to send the message again over UDP.
Default: UDP
To use TCP or TCP (Fallback to UDP), to must enable SIP over TCP in the “System Parameters” page.
2. Select the Automatic Number Translation check box, if you want to apply this feature on the SIP trunk.
Default: Disabled.
Automatic Number Translation (ANT) of SETU ATA211 modifies the number strings—entire numbers or
part thereof—you dial into number strings understood by the IP network.
The ANT feature is useful when the network requires adding or stripping off of parts of the dialed number
strings. For example, the PSTN requires you to dial the prefix 00 for calling international numbers,
whereas the ITSP you have subscribed this SIP trunk restricts the dialing of the prefix 00 for international
numbers. If you happen to dial this prefix, your call will be rejected by the ITSP.
ANT is also used when SETU ATA211 is deployed for networking between PBXs at multiple sites, and
“Multi Stage Dialing” is required.
To use ANT, select the check box and configure the Automatic Number Translation Table. To do this,