wip (#182)

app.js

@@ -67,6 +67,8 @@ const {
 }, logger);
 const {
   client: redisClient,
+  addKey,
+  retrieveKey,
   createSet,
   retrieveSet,
   addToSet,
@@ -108,6 +110,8 @@ srf.locals = {...srf.locals,
     lookupSystemInformation
   },
   realtimeDbHelpers: {
+    addKey,
+    retrieveKey,
     createSet,
     incrKey,
     decrKey,

lib/call-session.js

@@ -7,8 +7,11 @@ const {
   nudgeCallCounts,
   roundTripTime,
   parseConnectionIp,
-  isPrivateVoipNetwork
+  isPrivateVoipNetwork,
+  makeFullMediaReleaseKey,
+  makePartnerFullMediaReleaseKey
 } = require('./utils');
+const { MediaPath } = require('./constants.json');
 
 const {forwardInDialogRequests} = require('drachtio-fn-b2b-sugar');
 const {parseUri, stringifyUri, SipError} = require('drachtio-srf');
@@ -61,7 +64,10 @@ class CallSession extends Emitter {
     this.activeCallIds = this.srf.locals.activeCallIds;
 
     this.decrKey = req.srf.locals.realtimeDbHelpers.decrKey;
-    this._mediaReleased = false;
+    this.addKey = req.srf.locals.realtimeDbHelpers.addKey;
+    this.retrieveKey = req.srf.locals.realtimeDbHelpers.retrieveKey;
+
+    this._mediaPath = MediaPath.FullMedia;
 
     this.application_sid = req.locals.application_sid;
     this.account_sid = req.locals.account_sid;
@@ -79,7 +85,7 @@ class CallSession extends Emitter {
   }
 
   get isMediaReleased() {
-    return this._mediaReleased;
+    return this._mediaPath !== MediaPath.FullMedia;
   }
 
   get isFive9VoiceStream() {
@@ -392,6 +398,14 @@ class CallSession extends Emitter {
         trace_id: uac.res?.get('X-Trace-ID') || '00000000000000000000000000000000'
       };
     }
+
+    /* save far end SDP for later use if we do a full media release */
+    if (process.env.JAMBONES_ENABLE_FULL_MEDIA_RELEASE) {
+      const key = makeFullMediaReleaseKey(this.req.get('Call-ID'));
+      const sdp = this.req.body;
+      this.logger.info({key, sdp}, 'saving far end sdp for full media release feature');
+      this.addKey(key, sdp, 3600).catch((err) => this.logger.error(err, 'Error saving far end sdp'));
+    }
     this.uas = uas;
     this.uac = uac;
     [uas, uac].forEach((dlg) => {
@@ -605,6 +619,7 @@ Duration=${payload.duration} `
     const toTag = dlg.type === 'uas' ? this.rtpEngineOpts.uac.tag : this.rtpEngineOpts.uas.tag;
     const reason = req.get('X-Reason');
     const isReleasingMedia = reason && dlg.type === 'uac' && ['release-media', 'anchor-media'].includes(reason);
+    const isFullMediaRelease = reason === 'release-media-entirely' && process.env.JAMBONES_ENABLE_FULL_MEDIA_RELEASE;
     const offerMedia = dlg.type === 'uas' ? this.rtpEngineOpts.uac.mediaOpts : this.rtpEngineOpts.uas.mediaOpts;
     const answerMedia = dlg.type === 'uas' ? this.rtpEngineOpts.uas.mediaOpts : this.rtpEngineOpts.uac.mediaOpts;
     const direction =  dlg.type === 'uas' ? ['public', 'private'] : ['private', 'public'];
@@ -666,6 +681,26 @@ Duration=${payload.duration} `
         }
         return;
       }
+
+      if (isFullMediaRelease) {
+        const b_sdp = await this.retrieveKey(makePartnerFullMediaReleaseKey(this.req.get('Call-ID')));
+        this.logger.info({b_sdp}, 'reinvite ourselves out of the media path with this reinvite offer');
+        const answerSdp = await dlg.other.modify(b_sdp);
+        this.logger.info({answerSdp}, 'far end response to full media release');
+        res.send(200, {
+          body: dlg.local.sdp,
+          headers: {
+            'Contact': this.contactHeader
+          }
+        });
+        /* no media going through us now we can destroy the rtpengine resource */
+        this.rtpEngineResource.destroy().catch((err) => {
+          this.logger.info({err}, 'Error destroying rtpengine resource after full media release');
+        });
+        this._mediaPath = MediaPath.NoMedia;
+        return;
+      }
+
       const offeredSdp = Array.isArray(req.payload) && req.payload.length > 1 ?
         req.payload.find((p) => p.type === 'application/sdp').content :
         req.body;
@@ -695,12 +730,14 @@ Duration=${payload.duration} `
       let sdp;
       //HL 2024-11-13: previously forwarded re-invites to webrtc clients but further testing has shown to be unnecessary
       //if (isReleasingMedia && !this.callerIsUsingSrtp) {
-      if (isReleasingMedia) {
+
-        this.logger.info({response}, `got a reinvite from FS to ${reason}`);
+      //DH 2024-11- 18: if we are going from no-media to either partial or full media, we need reinvite the far end
+      if (isReleasingMedia && this._mediaPath !== MediaPath.NoMedia) {
         sdp = dlg.other.remote.sdp;
         if (!answerMedia.flags.includes('asymmetric')) answerMedia.flags.push('asymmetric');
         answerMedia.flags = answerMedia.flags.filter((f) => f !== 'media handover');
-        this._mediaReleased = 'release-media' === reason;
+        this._mediaPath = 'release-media' === reason ? MediaPath.PartialMedia : MediaPath.FullMedia;
+        this.logger.debug(`media path is now ${this._mediaPath}`);
       }
       else {
         sdp = await dlg.other.modify(response.sdp);

lib/constants.json

@@ -3,5 +3,10 @@
     "ScaleIn": "scale-in",
     "StandbyEnter": "standby-enter",
     "StandbyExit": "standby-exit"
+  },
+  "MediaPath": {
+    "NoMedia": "no-media",
+    "PartialMedia": "partial-media",
+    "FullMedia": "full-media"
   }
 }

lib/utils.js

@@ -246,6 +246,12 @@ const parseHostPorts = (logger, hostports, srf) => {
   return obj;
 };
 
+const makeFullMediaReleaseKey = (callId) => {
+  return `a_sdp:${callId}`;
+};
+const makePartnerFullMediaReleaseKey = (callId) => {
+  return `b_sdp:${callId}`;
+};
 
 module.exports = {
   isWSS,
@@ -265,6 +271,8 @@ module.exports = {
   parseConnectionIp,
   isMSTeamsCIDR,
   isPrivateVoipNetwork,
-  parseHostPorts
+  parseHostPorts,
+  makeFullMediaReleaseKey,
+  makePartnerFullMediaReleaseKey
 };