support sending DTMF to caller (#125)

* support sending DTMF to caller

* wip

lib/call-session.js

@@ -780,6 +780,27 @@ Duration=${payload.duration} `
             )).every((r) => r);
           }
           res.send(succeeded ? 200 : 503);
+        } else if (reason.includes('Dtmf')) {
+          const arr = /Signal=\s*([0-9#*])/.exec(req.body);
+          if (!arr) {
+            this.logger.info({body: req.body}, '_onInfo: invalid INFO Dtmf');
+            throw new Error(`_onInfo: no dtmf in body for ${contentType}`);
+          }
+          const code = arr[1];
+          const arr2 = /Duration=\s*(\d+)/.exec(req.body);
+          const duration = arr2 ? arr2[1] : 250;
+          const dtmfOpts = {
+            ...this.rtpEngineOpts.common,
+            'from-tag': this.rtpEngineOpts.uac.tag,
+            code,
+            duration
+          };
+          const response = await this.playDTMF(dtmfOpts);
+          if ('ok' !== response.result) {
+            this.logger.info({response}, `rtpengine play Dtmf failed with ${JSON.stringify(response)}`);
+            throw new Error('rtpengine failed: answer');
+          }
+          res.send(200);
         }
       }
       else if (dlg.type === 'uas' && ['application/dtmf-relay', 'application/dtmf'].includes(contentType)) {

lib/db-utils.js

@@ -142,7 +142,7 @@ module.exports = (srf, logger) => {
     const failure = {fromCarrier: false};
     const uri = parseUri(req.uri);
     const isDotDecimal = /^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/.test(uri.host);
-
+    const did = normalizeDID(req.calledNumber) || 'anonymous';
     if (!isDotDecimal) {
       /**
        * The host part of the SIP URI is not a dot-decimal IP address,
@@ -175,12 +175,19 @@ module.exports = (srf, logger) => {
           .sort((a, b) => b.netmask - a.netmask);
         const selected = gw.find(gatewayMatchesSourceAddress.bind(null, logger, req.source_address));
         if (selected) {
+          const sql =
+            `SELECT application_sid FROM phone_numbers WHERE number = '${did}'
+            AND voip_carrier_sid = '${selected.voip_carrier_sid}'
+            AND account_sid = '${a[0].account_sid}'`;
+          logger.debug({selected, sql, did}, 'looking up DID');
+          const [r] = await pp.query(sql);
+
           return {
             fromCarrier: true,
             gateway: selected,
             service_provider_sid: a[0].service_provider_sid,
             account_sid: a[0].account_sid,
-            application_sid: selected.application_sid,
+            application_sid: r[0]?.application_sid || selected.application_sid,
             account: a[0]
           };
         }
@@ -207,12 +214,19 @@ module.exports = (srf, logger) => {
           const [a] = await pp.query(sqlAccountBySid, [[matches[0].account_sid]]);
           if (0 === a.length) return failure;
           logger.debug({matches}, `found registration carrier using ${uri.host} and ${uri.user}`);
+          const sql =
+            `SELECT application_sid FROM phone_numbers WHERE number = '${did}'
+            AND voip_carrier_sid = '${matches[0].voip_carrier_sid}'
+            AND account_sid = '${matches[0].account_sid}'`;
+          logger.debug({matches: matches[0], sql, did}, 'looking up DID');
+
+          const [r] = await pp.query(sql);
           return {
             fromCarrier: true,
             gateway: matches[0],
             service_provider_sid: a[0].service_provider_sid,
             account_sid: a[0].account_sid,
-            application_sid: matches[0].application_sid,
+            application_sid: r[0]?.application_sid || matches[0].application_sid,
             account: a[0]
           };
         }
@@ -264,7 +278,6 @@ module.exports = (srf, logger) => {
       if (matches.length) {
         /* we have one or more matches.  Now check for one with a provisioned phone number matching the DID */
         const vc_sids = matches.map((m) => `'${m.voip_carrier_sid}'`).join(',');
-        const did = normalizeDID(req.calledNumber) || 'anonymous';
         const sql =  `SELECT * FROM phone_numbers WHERE number = '${did}' AND voip_carrier_sid IN (${vc_sids})`;
         logger.debug({matches, sql, did, vc_sids}, 'looking up DID');
 

lib/utils.js

@@ -22,8 +22,8 @@ function makeRtpEngineOpts(req, srcIsUsingSrtp, dstIsUsingSrtp, teams = false) {
   const dstOpts = dstIsUsingSrtp ? srtpOpts : rtpCopy;
   const srcOpts = srcIsUsingSrtp ? srtpOpts : rtpCopy;
 
-  /* webrtc clients (e.g. sipjs) send DMTF via SIP INFO */
-  if ((srcIsUsingSrtp || dstIsUsingSrtp) && !teams) {
+  /* Allow Feature server to inject DTMF to both leg except call from Teams*/
+  if (!teams) {
     dstOpts.flags.push('inject DTMF');
     srcOpts.flags.push('inject DTMF');
   }