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In some cases, my assistants (inbound) say nothing for the first couple of seconds, before starting with the first message.

Here are two call IDs:
8d2141cc-dae3-4b27-8a7e-7942e0b235d5
2422b273-6932-41ee-a08b-da2acdad76a3

<@792107071624445953>
I understand that there's a delay before your assistants begin speaking on some calls. To address this, we can check the `assistantOverrides.firstMessageMode` setting to ensure it's configured correctly. If it's set to 'assistant-waits-for-user', this might cause the initial silence you're experiencing. Would you like me to check and adjust this setting for you?

You can continue this conversation by mentioning me in the message.

It is due to the cold start issue. Most probably, due to this call, none of the workers were free, so a new worker was spun up, resulting in you facing this issue.

thanks! can anything be done against this?

Currently, no. But, you won't face this issue like all the time.