fixed phone type, see https://msdn.microsoft.com/en-us/library/microsoft.exchange.webservices.data.phonenumberkey%28v=exchg.80%29.aspx
fixed phone type, see https://msdn.microsoft.com/en-us/library/microsoft.exchange.webservices.data.phonenumberkey%28v=exchg.80%29.aspx

Garethp/php-ews