Technical data

How Calls Are Processed
Dialogic
®
Diva
®
SIPcontrol
TM
Software 1.8 Reference Guide page 47
Emergency calls
In many environments, certain numbers, e.g., 110/112 in Germany or 911 in the U.S., have to be handled
differently from others. For example, they might need to be dialed without any access digit.
This can be achieved by creating an additional route from any configured SIP peers to one or more PSTN interfaces
and setting the called address expression to the emergency number(s). The route should be placed at the top
position in the list. Should there be a dialplan and/or address map configured for the respective PSTN interfaces,
it may be necessary to add another regular expression to the address maps of the interfaces to handle those calls.
Routing conditions
The Dialogic
®
Diva
®
SIPcontrol
TM
Software organizes the conditions of a route in a list. Each list entry consists
of different expressions for called, calling, and redirected address. The route matches only if all three expressions
simultaneously match the respective call addresses. Empty expressions are considered to match, so there is no
need to add wildcards into unused expressions. As a result, if a call should match either a called address or a
calling number, two list entries have to be created, with called expression in the first and calling expression in
the second row. If both have to match concurrently, both expressions have to be entered into the same list entry.
Routing examples
This section describes the configuration of four possible routing scenarios:
Direct routing between one PSTN interface and one SIP peer
below
Connect two SIP peers to two PSTN interfaces exclusively below
Connect two SIP peers to the same PSTN interface on page 48
Load balancing or failover between two SIP peers on page 49
Direct routing between one PSTN interface and one SIP peer
If you choose to route all calls from the PSTN to the same SIP peer, and calls from that SIP peer to the PSTN,
configure the parameters as follows. For this configuration, no address rewriting is needed:
1. Under PSTN Interface Configuration, enable and configure all PSTN interfaces connected to a PBX.
Confirm each dialog box with OK.
2. Under SIP Peer Configuration, create a SIP peer with the necessary settings and make sure that the
option Default SIP to PSTN peer is enabled. Confirm with OK.
3. Under Routing Configuration, create route no. 1 and do the following:
•Select PSTN to SIP as direction.
• Enable all required PSTN interfaces.
• Select the SIP peer configured in step 2 as the Master destination.
• Set the parameter Number format to Unchanged.
• Confirm with OK.
4. Under Routing Configuration, create route no. 2 and do the following:
•Select SIP to PSTN as direction.
• Enable the SIP peer configured in step 2 as source peer.
• Enable all required PSTN interfaces as the Master destination.
• Set the parameter Number format to Unchanged.
• Confirm with OK.
5. Save the configuration in the main configuration interface.