Telephony signalling and routing

This section describes how to configure Digital Fax to properly interact with a local SBC (Direct Routing) or with SBCs located at Service Provider's data center (Operator Connect) in  terms of protocols and routing.

Voip configuration can be tuned through the "IP Routes" page. From the home page select "Fax" => "Application Settings" => "IP Routes".

WARNING: you have to stop and restart the Digital Fax service from the web interface after any change done in this page.

Limitation: E164 doesn't work for outgoing faxes, caused by a Microsoft limitation the Digital fax cannot send the called number to the telephony platform in E164 format, it will manipulate replacing + to 00 (example +39 ⇒ 0039)

Telephony Protocol and Negotiation

Here you must choose SIP protocol.

The two options on negotiation ("Allow G.711 for outgoing faxes" and "Disable T.38 for incoming faxes") are to be left unchecked for most SBC configurations. Please check your Service Provider for T.38 support availability.

Outgoing routing

Default Route

By default, Digital Fax routes all outgoing faxes to the nearest Imagicle Public SBC IP address. This is called the Default Route, and should be the IP address of the local SBC enabled to send the faxes. Please choose among these regions:

• EU Region: 172.32.9.136
• US Region: 172.31.128.157
• ME Region: 172.32.1.86

Warning: If the Default Route is not set, Digital Fax can't send faxes.

Multiple routes and Least Cost Routing

Digital Fax can manage multiple routes, i.e. routing to multiple regions, based on the first digits of the CALLED number. E.g. you can configure it so that all the outgoing fax calls that have a recipient's telephone number beginning by 001 are routed to local US SBC. The faxes that do not match this rule leverages the Default Route.

In the "Set IP Routes" dialog, just enter the prefix and the IP and click "Add".

Adding a prefixes to outgoing faxes

Digital Fax can add a prefix to outgoing fax numbers (for LCR or any other aim) through the IP Routes section. In the Routing Parameters box select the "Global" PBX routing type, enter the prefix and press "Save". This parameter only affects off-net outgoing faxes, see below.

This option affects Print To Fax, Web To Fax and Email To Fax features too.

Network Routing Type

Set this option on "External only". If you want to send faxes form Digital Fax to internal fax numbers, please refer to the advanced configuration chapter.