AI-generated Key Takeaways
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          A Call extension represents an ad extension type that displays a phone number allowing users to call directly from the ad. 
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          Key fields for a Call extension include the advertiser's phone number, country code, and settings related to call tracking and conversion reporting. 
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          Call tracking and conversion reporting can be enabled or disabled, and a specific conversion action can be attributed to calls. 
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          The call_conversion_reporting_stateindicates whether the extension uses its own call conversion setting or follows the account level setting.
Represents a Call extension.
| Fields | |
|---|---|
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 | Enum value that indicates whether this call extension uses its own call conversion setting (or just have call conversion disabled), or following the account level setting. | 
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 The advertiser's phone number to append to the ad. This string must not be empty. | 
| 
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 Uppercase two-letter country code of the advertiser's phone number. This string must not be empty. | 
| 
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 Indicates whether call tracking is enabled. By default, call tracking is not enabled. | 
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 The conversion action to attribute a call conversion to. If not set a default conversion action is used. This field only has effect if call_tracking_enabled is set to true. Otherwise this field is ignored. | 
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 If true, disable call conversion tracking. call_conversion_action should not be set if this is true. Optional. |