Invalid description, no ice-ufrag attribute at level 0 Error

I was trying to implement a sipjs session.

initializeSip() {
const uri = UserAgent.makeURI('sip:test@192.168.1.10'); // Replace with your SIP URI
if (!uri) {
throw new Error('Failed to create URI');
}

const userAgentOptions: UserAgentOptions = {
uri,
transportOptions: {
server: 'ws://127.0.0.1:9090',
},

delegate: {
onInvite: (invitation: Invitation) => {
return this.handleIncomingCall(invitation);
},
},
};

this.userAgent = new UserAgent(userAgentOptions);

const registererOptions: RegistererOptions = {
// Customize registererOptions as needed
};
this.registerer = new Registerer(this.userAgent, registererOptions);

this.userAgent.start().then(() => {
this.registerer.register();
})}


this is how defined accept call in handleIncomingCall function

const acceptCall = () => {
const constraints = {
audio: true,
video: false,
};

navigator.mediaDevices
.getUserMedia(constraints)
.then((localStream) => {
// Attach local stream to an audio element if needed
const localAudio = document.getElementById(
'localAudio'
) as HTMLAudioElement;
if (localAudio) {
localAudio.srcObject = localStream;
}
})
.catch((error) => {
console.error('Error getting user media:', error);
});

const peerConnectionConfig = {
iceServers: [
{
urls: ['stun:stun.l.google.com:19302'],

},
],
iceTransportPolicy: 'all',
bundlePolicy: 'balanced' as RTCBundlePolicy,
rtcpMuxPolicy: 'require' as RTCRtcpMuxPolicy,
};

const options = {
sessionDescriptionHandlerOptions: {
constraints,
peerConnectionConfiguration: peerConnectionConfig,
peerConnectionOptions: {
rtcConfiguration: peerConnectionConfig,
iceGatheringTimeout: 5000,
},
},
};

// Accept the call
// Adding the listener for state changes

invitation
.accept(options)
.then(() => {
console.log('Call accepted successfully');
})
.catch((error) => {
console.error('Failed to accept call:', error);
});
};


I configured discription and pass that to an argument while accepting the invitation. but even after i am passing i an getting below error. i tried to solve in many ways, but nothing seems working.is there any mistakes while i passing the ice flags ?

sip.SessionDescriptionHandler | SessionDescriptionHandler.setDescription failed - InvalidAccessError: Invalid description, no ice-ufrag attribute at level 0

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