I have looked through all the examples that Microsoft have given for the Graph API to make calls. All the samples are using "Service Hosted Media", I am looking for an example for "Application Hosted Media". There is nothing in the documents what define what the "blob" attribute should be, I have played around using a SIP SDP with PCMU codec but all it gives is an error:

{"error":
    {
     "code":"9999",
     "message":"Unknown internal server error.",
     "innerError":
      {
       "date":"2025-02-05T04:36:18",
       "request-id":"ada9f5d2-85d5-4f39-a539-40b8f628b043",
       "client-request-id":"ada9f5d2-85d5-4f39-a539-40b8f628b043"
      }
   }
}

Has anyone had success with this API with Application Hosted Media.

I have tried to send this request where the blob is base64 encoded SIP SDP encapulated in a "MediaSession" object.

{
  "@odata.type": "#microsoft.graph.call",
  "callbackUri": ".ashx",
  "source": {
    "@odata.type": "#microsoft.graph.participantInfo",
    "identity": {
      "@odata.type": "#microsoft.graph.identitySet",
      "application": {
        "@odata.type": "#microsoft.graph.identity",
        "displayName": "CallingBot",
        "id": "6f78d2bb-4e78-408d-a739-e084d79f5863"
      }
    }
  },
  "targets": [
    {
      "@odata.type": "#microsoft.graph.invitationParticipantInfo",
      "identity": {
        "@odata.type": "#microsoft.graph.identitySet",
        "user": {
          "@odata.type": "#microsoft.graph.identity",
          "displayName": "TestName",
          "id": "496ebb4d-e5cc-4340-8359-3714c3bdd456"
        }
      }
    }
  ],
  "requestedModalities": [
    "audio"
  ],
  "TenantId": "dabdceb5-cddf-4257-8b35-9f5eb7ac03er",
  "mediaConfig": {
    "@odata.type": "#microsoft.graph.appHostedMediaConfig",
    "blob":     "eyJtZWRpYVNlc3Npb24iOnsiaWQiOiI4MDE2NDViOC1kOGUyLTQ3NTQtYTk4YS0zNmE2MzQ1M2FmYjciLCJzdHJlYW1zIjpbeyJzdHJlYW1JZCI6IjEiLCJtZWRpYVR5cGUiOiJhdWRpbyIsImRpcmVjdGlvbiI6InNlbmRyZWN2IiwidHJhbnNwb3J0Ijp7InByb3RvY29sIjoidWRwIiwiaXBBZGRyZXNzIjoiNTcuMy4xMDguMjE5IiwicG9ydCI6MTYzMDB9LCJjb2RlYyI6eyJuYW1lIjoiUENNVSIsImNsb2NrUmF0ZSI6ODAwMCwicGF5bG9hZFR5cGUiOjB9fV19fQ=="
  }
}