491 request pending

General
1

Hello, Do u know by any chance why im getting this error.

context:
actually what is happening is im getting a incoming call and im accepting it then after a delay of 2sec when i recive webrtcup im making a another call by creating helper with same master and that new handle is used for making new call.. some times it will work..and sometimes it will stop at calling state and this error comes

{
  janus: 'event',
  session_id: 5311078810690285,
  transaction: 'txn-7500dbb5-0c0f-4710-82ea-b5df4ecf5e95',
  sender: 7080728223756598,
  plugindata: {
    plugin: 'janus.plugin.sip',
    data: {
      sip: 'event',
      result: { event: 'hangup', code: 491, reason: 'Request Pending' },
      call_id: 'txn-1279823c-68f5-4c6c-a1d9-a05635b3389d'
Menu
    }
  }
}
2

491 is not an error the plugin generates. You should check the SIP exchange, e.g., with Wireshark to check who sends the 491 and why.