createCall: add a default behavior if the trunk isn't defined (#230)

* add methods to lookupTrunkbyPhone

* change the object name

* fix typo in readme

* export method with return

* add checks to dial verb

* sans extra spaces

* change the variable name for lookup

lib/http-routes/api/create-call.js

@@ -85,6 +85,20 @@ router.post('/', async(req, res) => {
       }
     }
 
+    /**
+     * trunk isn't specified,
+     * check if from-number matches any existing numbers on Jambonz
+     *  */
+    if (target.type === 'phone' && !target.trunk) {
+      const {lookupCarrierByPhoneNumber} = dbUtils(this.logger, srf);
+      const voip_carrier_sid = await lookupCarrierByPhoneNumber(req.body.account_sid, restDial.from);
+      logger.info(
+        `createCall: selected ${voip_carrier_sid} for requested phone number: ${restDial.from || 'unspecified'})`);
+      if (voip_carrier_sid) {
+        opts.headers['X-Requested-Carrier-Sid'] = voip_carrier_sid;
+      }
+    }
+
     /* create endpoint for outdial */
     const ms = getFreeswitch();
     if (!ms) throw new Error('no available Freeswitch for outbound call creation');