Updating phone list on user profile.

Hi

I have to update  phone number on Business-2 filed which shows in outlook  user contact card. From powershell command I can fetch the information

get-aduser venky -Properties * | Format-List otherTelephone

otherTelephone : {5332}

But I cannot add the number in the field.

Get-ADUser -Identity "venky" | Set-ADUser format-list -otherTelephone "55555"

But throws error: Set-ADUser : A parameter cannot be found that matches parameter name 'otherTelephone'.

Can you please help me how can I set the phone number on business2 on outlook contact card of user?

Thanks

Venky