WebRTC softphone connection drops at 300 concurrent agents

Voice & Telephony
1

Just noticed that WebRTC softphone connections drop randomly when pushing JMeter threads to 300 concurrent agents. Setup is JMeter 5.6.2 running from Singapore. No 429s, but WebSocket disconnects with code 1006.

  1. Auth via OAuth token endpoint
  2. Initiate WebSocket connection for softphone
  3. Hold for 60 seconds

Any insights on platform capacity limits or JMeter config tweaks?