Add "version" to dialin sessions.

api_backend.go

@@ -525,6 +525,7 @@ type BackendServerInfoDialout struct {
 	Connected bool     `json:"connected"`
 	Address   string   `json:"address,omitempty"`
 	UserAgent string   `json:"useragent,omitempty"`
+	Version   string   `json:"version,omitempty"`
 	Features  []string `json:"features,omitempty"`
 }
 

backend_server.go

@@ -1023,7 +1023,17 @@ func (b *BackendServer) serverinfoHandler(w http.ResponseWriter, r *http.Request
 		if client := session.GetClient(); client != nil && client.IsConnected() {
 			dialout.Connected = true
 			dialout.Address = client.RemoteAddr()
-			dialout.UserAgent = client.UserAgent()
+			if ua := client.UserAgent(); ua != "" {
+				dialout.UserAgent = ua
+				// Extract version from user-agent, expects "software/version".
+				if pos := strings.IndexByte(ua, '/'); pos != -1 {
+					version := ua[pos+1:]
+					if pos = strings.IndexByte(version, ' '); pos != -1 {
+						version = version[:pos]
+					}
+					dialout.Version = version
+				}
+			}
 			dialout.Features = session.GetFeatures()
 		}
 		info.Dialout = append(info.Dialout, dialout)

docs/standalone-signaling-api-v1.md

@@ -1549,6 +1549,7 @@ will contain an additional property `dialout` with the following contents:
         "connected": true,
         "address": "192.168.1.0",
         "useragent": "spreed-webrtc-sip-bridge/1.2.3",
+        "version": "1.2.3",
         "features": [
           "start-dialout",
           "datachannels",