AT&T Synapse SB67070 SIP Configuration Manual page 13

 exclude a trunk by selecting it, then clicking < Remove. You may want to exclude a
trunk if it is being used for a fax line or a door phone line, for example.
 move a trunk up or down the priority list by selecting it, then clicking  or .
3. Set the Call Log/Messages Prefix according to your Dialing Rules. You can enter a
maximum of eight digits using only the characters 0–9, #, *, or P. Leave the field blank
if the Dialing Rules do not use a number for external line access.
4. Enter or modify Dialing Rule patterns. For more information, see "About Dialing Rules" in
the Synapse System Administrator's Guide.
5. Select a Route for each Dialing Rule pattern as required. The list of routes includes all
available trunks in the system, as well as the Default Routing Priority. You can route a
Dialing Rule pattern to use the SIP Gateway only, or to use the Default Routing Priority.
6. Click Apply to save these settings.
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