increase dtmf volume (#184)

https://github.com/jambonz/jambonz-feature-server/issues/1272

lib/call-session.js

@@ -8,7 +8,8 @@ const {
   isBlackListedSipGateway,
   makeFullMediaReleaseKey,
   makePartnerFullMediaReleaseKey,
-  isValidDomainOrIP
+  isValidDomainOrIP,
+  removeVideoSdp
 } = require('./utils');
 const { MediaPath } = require('./constants.json');
 const {forwardInDialogRequests} = require('drachtio-fn-b2b-sugar');
@@ -938,8 +939,12 @@ Duration=${payload.duration} `
         throw new Error(`_onReinvite: rtpengine failed: ${JSON.stringify(response)}`);
       }
       this.logger.debug({opts, sdp: response.sdp}, 'CallSession:_onReinvite: (answer) sending back upstream');
+      let responseSdp = response.sdp;
+      if (process.env.JAMBONES_VIDEO_CALLS_ENABLED_IN_FS) {
+        responseSdp = removeVideoSdp(responseSdp);
+      }
       res.send(200, {
-        body: response.sdp,
+        body: responseSdp,
         headers: {
           'Contact': this.contactHeader
         }
@@ -1101,11 +1106,13 @@ Duration=${payload.duration} `
           const code = arr[1];
           const arr2 = /Duration=\s*(\d+)/.exec(req.body);
           const duration = arr2 ? arr2[1] : 250;
+          const volume = 13;
           const dtmfOpts = {
             ...this.rtpEngineOpts.common,
             'from-tag': this.rtpEngineOpts.uas.tag,
             code,
-            duration
+            duration,
+            volume
           };
           const response = await this.playDTMF(dtmfOpts);
           if ('ok' !== response.result) {

lib/utils.js

@@ -3,6 +3,7 @@ const srtpCharacteristics = require('../data/srtp-transcoding');
 const debug = require('debug')('jambonz:sbc-outbound');
 const CIDRMatcher = require('cidr-matcher');
 const dns = require('dns');
+const sdpTransform = require('sdp-transform');
 
 function makeRtpEngineOpts(req, srcIsUsingSrtp, dstIsUsingSrtp, padCrypto, teams) {
   const from = req.getParsedHeader('from');
@@ -334,7 +335,12 @@ function isValidDomainOrIP(input) {
 
   return false; // Invalid input
 }
-
+const removeVideoSdp = (sdp) => {
+  const parsedSdp = sdpTransform.parse(sdp);
+  // Filter out video media sections, keeping only non-video media
+  parsedSdp.media = parsedSdp.media.filter((media) => media.type !== 'video');
+  return sdpTransform.write(parsedSdp);
+};
 module.exports = {
   makeRtpEngineOpts,
   selectHostPort,
@@ -349,5 +355,6 @@ module.exports = {
   isBlackListedSipGateway,
   makeFullMediaReleaseKey,
   makePartnerFullMediaReleaseKey,
-  isValidDomainOrIP
+  isValidDomainOrIP,
+  removeVideoSdp
 };