The Architect flow sits on v2024.2.0 and the Data Action just keeps throwing 400 Bad Request: Invalid response format. The REST endpoint points to the Ribbon SBC management API. Request body goes through fine, but response handling breaks immediately. The SBC returns raw SDP instead of JSON, and the Genesys parser doesn’t know what to do with it.
Checking the transaction logs shows the initial request follows RFC 3261 timers perfectly. The SDP negotiation starts, but the answer payload ignores RFC 8829 media attribute ordering. It puts the payload types backwards. The ICE candidates also look wrong. RFC 5245 requires the typ field to match the foundation, but the SBC spits out typ host when it should be typ relay for the TURN allocation. The WebRTC client tries to use those candidates and the media path drops before the ringtone even plays.
Here is the SIP trace from the edge node:
INVITE sip:1001@192.168.10.50:5060 SIP/2.0
v=0
o=- 3923834328 3923834328 IN IP4 10.0.4.12
s=-
c=IN IP4 10.0.4.12
t=0 0
m=audio 5004 UDP/TLS/RTP/SAVPF 111 103 104
a=ice-ufrag:JbKL
a=ice-pwd:9s2k8d7f3m2
a=fingerprint:sha-256 A1:B2:C3...
a=candidate:1 1 UDP 2130706431 10.0.4.12 5004 typ host
The Data Action mapping step expects a JSON object with ice_candidate and sdp_offer fields. The raw text response breaks the field mapping. It’s doing jack all when the parser hits the m= line. You can’t force the schema validation to skip. Workaround sits in a simple Python middleware that strips the SDP and converts it to JSON before sending it back. That actually works for the mapping step, but the ICE candidates still fail the connectivity check. The mic stays hot on the agent side because the early media path never establishes.
The Data Action timeout should probably push past 45s to wait for the full ICE gathering. The ribbon config forces a strict answer delay. The flow won’t proceed past the mapping node. Calls drop to voicemail and the queue metrics look terrible.
We’ve tested this on three different edge clusters and the result stays the same.
{
"error": "DataActionExecutionFailed",
"message": "Response payload does not match expected schema",
"code": 400,
"traceId": "a8f3c2d1-9b4e-4f2a-8c1d-7e6f5a4b3c2d"
}
PureCloudPlatformClientV2 handles the Data Action response mapping by expecting a strict JSON structure before it attempts to deserialize the payload. The SBC is sending raw SDP text, which breaks the default parser immediately. First, the Studio runtime checks the Content-Type header on the response. When it sees application/sdp or text/plain, it still tries to run JSON.parse() on the body if you’ve mapped output variables directly in the Data Action settings. You need to intercept that raw string before the mapping step runs.
The fix sits in a quick JavaScript snippet action right before the Data Action finishes. Instead of letting Studio handle the deserialization, you’ll grab the raw response body and wrap it manually.
const rawSdp = context.getVariable("responseBody");
const sdpObj = {
version: 0,
media: rawSdp.split("\n").filter(line => line.startsWith("m=")).join("|"),
raw: rawSdp
};
context.setVariable("parsedSdp", JSON.stringify(sdpObj));
Then point the Data Action output variables to that new parsedSdp variable instead of the default response field. Never leave the response format set to JSON when the target API returns plain text or SDP. The parser will keep throwing 400s until you switch the Data Action configuration to text/plain or handle it in the snippet layer. Works better that way. The routing table won’t even touch the flow if the mapping fails early on. Check the execution logs after swapping the variable reference. The timeout window shrinks to two seconds after that.
Problem
The native Data Action parser rejects raw SDP payloads because the Studio runtime enforces strict JSON deserialization. Direct calls to legacy SBC management endpoints will always trigger that 400 response when the Content-Type header returns application/sdp. The pipeline needs an intermediate transformation layer before the payload reaches the Architect flow.
Code
- name: Cache Sanitized SBC Config
run: |
curl -s -H "Authorization: Bearer ${{ secrets.GC_OAUTH_TOKEN }}" \
https://api.mypurecloud.com/api/v2/configuration/documents/sbc-sdp-cache \
-X PUT \
-H "Content-Type: application/json" \
-d '{"type":"sbc-config","value":{"mediaPort":"5060","codec":"G711"}}'
Error
You’ll hit a 422 Unprocessable Entity if the documentId parameter doesn’t align with an existing resource or if the OAuth scope misses configuration:write. The logs just dump a validation error. You’ll need to patch the documentId manually if the CI runner caches stale artifacts. Terraform state drift usually causes the mismatch during cross-environment promotions.
Question
How are you handling the credential rotation for the SBC management endpoint in your Terraform state files
HTTP 400 Bad Request: Invalid response format. Wrapping that raw SDP string in a JSON object just to satisfy the parser creates bigger problems downstream. The Data Action accepts the wrapper, but the payload stays opaque.
Studio runtime swallows the JSON structure. The text inside remains unstructured. Route this to EventBridge or a Kafka topic and the schema registry validation fails instantly. SDP lacks a stable schema. Consumer groups get flooded with REJECTED_SCHEMA errors. Offsets corrupt quickly.
The SBC API handles SIP signaling. It’s not built for REST data exchange. Forcing it into a Data Action creates a brittle dependency on the response format. Hit the API from a Lambda function instead. The function handles the application/sdp response, extracts the needed fields, and returns clean JSON. Keeps the flow fast. Data stays clean.
Timeout settings need attention as well. Ribbon APIs lag under load. The 10-second default on Data Actions kills the flow if the SBC hesitates.
Problem
Wrap the raw SDP response in a JSON object before it hits the Data Action output mapper. PureCloudPlatformClientV2 throws a validation error when the response header returns application/sdp. We bypassed the deserialization step by routing the response through a lightweight Node proxy. You just need to intercept the raw string before the platform touches it.
{
"sdp_raw": "{{raw_sdp_body}}",
"media_type": "application/sdp",
"target_uri": "/api/v2/conversations/voice/engagements",
"scope": "conversations:view"
}
Error
The pipeline threw 400 Bad Request: Invalid response format until we wrapped the payload. Studio doesn’t parse raw text well. It’s a bit messy but works. You can’t just pipe binary SDP into the Data Action output variables.
Question
Does the Ribbon SBC support chunked encoding for larger negotiation blocks? The current setup drops packets when the session description crosses 4KB. We’re testing a base64 encode step next.