Calls.JoinGroupCall.All

const options = {
	authProvider,
};

const client = Client.init(options);

const answer = {
  callbackUri: 'callbackUri-value',
  mediaConfig: {
    '@odata.type': '#microsoft.graph.appHostedMediaConfig',
    blob: '<Media Session Configuration Blob>'
  },
  acceptedModalities: [
    'audio'
  ],
  callOptions: {
    '@odata.type': '#microsoft.graph.incomingCallOptions',
    isContentSharingNotificationEnabled: true,
    isDeltaRosterEnabled: true,
    isInteractiveRosterEnabled: true
  },
  participantCapacity: 200
};

await client.api('/communications/calls/{id}/answer')
	.post(answer);

Import-Module Microsoft.Graph.CloudCommunications

$params = @{
	callbackUri = "callbackUri-value"
	mediaConfig = @{
		"@odata.type" = "#microsoft.graph.appHostedMediaConfig"
		blob = "<Media Session Configuration Blob>"
	}
	acceptedModalities = @(
	"audio"
)
callOptions = @{
	"@odata.type" = "#microsoft.graph.incomingCallOptions"
	isContentSharingNotificationEnabled = $true
	isDeltaRosterEnabled = $true
	isInteractiveRosterEnabled = $true
}
participantCapacity = 200
}

Invoke-MgAnswerCommunicationCall -CallId $callId -BodyParameter $params

# Code snippets are only available for the latest version. Current version is 1.x
from msgraph import GraphServiceClient
from msgraph.generated.communications.calls.item.answer.answer_post_request_body import AnswerPostRequestBody
from msgraph.generated.models.app_hosted_media_config import AppHostedMediaConfig
from msgraph.generated.models.modality import Modality
from msgraph.generated.models.incoming_call_options import IncomingCallOptions
# To initialize your graph_client, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=python
request_body = AnswerPostRequestBody(
	callback_uri = "callbackUri-value",
	media_config = AppHostedMediaConfig(
		odata_type = "#microsoft.graph.appHostedMediaConfig",
		blob = "<Media Session Configuration Blob>",
	),
	accepted_modalities = [
		Modality.Audio,
	],
	call_options = IncomingCallOptions(
		odata_type = "#microsoft.graph.incomingCallOptions",
		is_content_sharing_notification_enabled = True,
		is_delta_roster_enabled = True,
		is_interactive_roster_enabled = True,
	),
	participant_capacity = 200,
)

await graph_client.communications.calls.by_call_id('call-id').answer.post(request_body)