SARK V4.0.0 Route
Outbound Call Routing
SARK schedules outbound calls onto specific trunks which you specify in route entries in the Outbound Panel. A route entry consists of a dialplan (in regular Asterisk dialplan format), together with a list of up to 4 paths, or trunks, which the dialler will use to place a call. Paths are selected in sequence, so the dialler will always first despatch a qualifying call onto trunk #1 and only if the trunk is unavailable will it attempt to use trunk #2, trunk #3 and so on. The dialplan serves as a filter to select calls which this route will handle, for example national calls, premium rate calls and so on, indeed any class of dial which can be characterised by the digits that comprise it.
Out-of-the-box, SARK has a single default route defined. It is a general catch-all which will take any dialled number longer than 4 digits and attempt to route it to "None", i.e., nowhere.
We can route calls that match the default dial-plan by simply specifying a trunk for them to use. For many applications that is enough, simply because there will often only be one physical trunk available to carry the calls and so everything will use that pathway. Of course you will want to augment this route by including any numbers less than 5 digits (for example, 999, 911, 112 and so on) that you also want to send out over the trunk.
Using multiple trunks on the same route
You can specify up to 4 different trunks to carry your calls in any given route. There are 2 "path" drop downs on the main panel and a further 2 in the edit panel. The way this works is that the trunks will fail-over from one to the other in the event that a trunk becomes unavailable. This is useful if you have a VoIP trunk to carry all of your main traffic and perhaps an ISDN trunk to fail-over to should the internet line fail for any reason.
Using multiple routes
You can also create multiple routes to route different classes of outbound call over different trunks. For example, you may wish to only send calls to the emergency services across an ISDN or analogue trunk or you may wish to send calls to cellphones only over a GSM gateway or international calls over a particular SIP carrier. This allows great flexibility in how you send calls across the Internat and PSTN networks.
