Running a persistent WebSocket connection via the Notification API for real-time presence updates. The channel drops at exactly the 30-minute mark every time. No error, no close frame - the socket just dies silently.
Setup:
- Channel created via
POST /api/v2/notifications/channels
- Subscribed to
v2.users.{id}.presence for 45 agents
- Client is a Node.js service using the
ws library
- Region: US-East-1
The channel ID and connectUri are valid. Heartbeat pings are being sent every 15 seconds. The connection works perfectly for exactly 30 minutes, then we get a close event with code 1000 and no reason string.
We re-create the channel and re-subscribe after disconnect, but we lose approximately 10-15 seconds of presence events during the reconnection window. Is there a way to extend the channel lifetime or overlap two channels?
The 30-minute expiration is by design and is documented in the Notification API reference, though it is easy to miss. Every notification channel has a hard TTL of 30 minutes from creation, regardless of activity. This is a server-side enforcement and cannot be extended through any configuration or API parameter.
The recommended pattern to eliminate the gap is to implement a dual-channel overlap strategy. Here is how it works in practice:
- Create Channel A and subscribe to your topics.
- At the 25-minute mark (5 minutes before expiration), create Channel B and subscribe to the same topics.
- You will now receive duplicate events on both channels for approximately 5 minutes. Deduplicate on the client side using the
eventBody.id field.
- When Channel A disconnects at 30 minutes, Channel B is already active and has 25 minutes remaining.
- At the 25-minute mark of Channel B, create Channel C. Repeat indefinitely.
The deduplication is straightforward because every notification event includes a unique correlation ID. We run this pattern across 15 BYOC trunk monitoring integrations and have not missed a single event in six months.
One critical detail: do not exceed 1,000 topic subscriptions per channel. If you are monitoring more than that, you will need to partition your subscriptions across multiple parallel channel pairs.
The dual-channel approach described above is the standard enterprise pattern. From an operational perspective, there is an additional consideration if you are running this in a containerized environment or behind a load balancer.
The WebSocket connection from the Genesys Cloud Notification API uses a specific subdomain (wss://streaming.{region}.purecloud.com). If your outbound proxy or firewall performs SSL inspection, the WebSocket upgrade handshake can intermittently fail on the second channel creation while the first is still active. This manifests as a 403 on the POST /api/v2/notifications/channels call.
We resolved this by adding the streaming subdomain to our proxy’s SSL inspection bypass list. The symptom looked identical to a rate limit but was actually a proxy-level issue.
Quick addition - if you are using the official Genesys Cloud Platform SDK for Node.js (purecloud-platform-client-v2), the SDK has a built-in notification handler that manages channel rotation automatically. You do not need to implement the dual-channel logic yourself.
const notificationsApi = new platformClient.NotificationsApi();
const channel = await notificationsApi.postNotificationsChannels();
const handler = new platformClient.NotificationHandler();
handler.setChannel(channel);
handler.setAutoReconnect(true);
The setAutoReconnect(true) flag handles the 30-minute rotation internally. We switched from a custom WebSocket implementation to the SDK handler and it eliminated all of the reconnection gap issues.